feat: 添加项目管理模块

- 新增 ProjectMapper 接口
- 新增 ProjectService 服务接口及实现
- 新增 ProjectController 控制器
- 新增 DTO: ProjectRequest, ProjectResponse, ProjectQueryRequest
- API 接口: 项目列表(分页)、项目详情、创建、更新、删除

backend/src/main/java/com/innovation/platform/controller/ProjectController.java

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+package com.innovation.platform.controller;
+
+import cn.dev33.satoken.annotation.SaCheckLogin;
+import com.baomidou.mybatisplus.core.metadata.IPage;
+import com.innovation.platform.common.PageResult;
+import com.innovation.platform.common.Result;
+import com.innovation.platform.dto.ProjectQueryRequest;
+import com.innovation.platform.dto.ProjectRequest;
+import com.innovation.platform.dto.ProjectResponse;
+import com.innovation.platform.service.ProjectService;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.Parameter;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.*;
+
+/**
+ * 项目管理控制器
+ */
+@Tag(name = "项目管理", description = "项目的增删改查接口")
+@RestController
+@RequestMapping("/api/projects")
+@RequiredArgsConstructor
+@SaCheckLogin
+public class ProjectController {
+
+    private final ProjectService projectService;
+
+    @Operation(summary = "分页查询项目列表")
+    @GetMapping
+    public Result<PageResult<ProjectResponse>> page(ProjectQueryRequest request) {
+        IPage<ProjectResponse> page = projectService.page(request);
+        return Result.success(PageResult.of(page));
+    }
+
+    @Operation(summary = "根据ID查询项目详情")
+    @GetMapping("/{id}")
+    public Result<ProjectResponse> getById(
+            @Parameter(description = "项目ID") @PathVariable Long id) {
+        ProjectResponse project = projectService.getById(id);
+        return Result.success(project);
+    }
+
+    @Operation(summary = "创建项目")
+    @PostMapping
+    public Result<Long> create(@Valid @RequestBody ProjectRequest request) {
+        Long id = projectService.create(request);
+        return Result.success("创建成功", id);
+    }
+
+    @Operation(summary = "更新项目")
+    @PutMapping("/{id}")
+    public Result<Void> update(
+            @Parameter(description = "项目ID") @PathVariable Long id,
+            @Valid @RequestBody ProjectRequest request) {
+        projectService.update(id, request);
+        return Result.success("更新成功", null);
+    }
+
+    @Operation(summary = "删除项目")
+    @DeleteMapping("/{id}")
+    public Result<Void> delete(
+            @Parameter(description = "项目ID") @PathVariable Long id) {
+        projectService.delete(id);
+        return Result.success("删除成功", null);
+    }
+}

backend/src/main/java/com/innovation/platform/dto/ProjectQueryRequest.java

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+package com.innovation.platform.dto;
+
+import lombok.Data;
+
+/**
+ * 项目查询请求 DTO
+ */
+@Data
+public class ProjectQueryRequest {
+    /**
+     * 项目名称（模糊查询）
+     */
+    private String projectName;
+
+    /**
+     * 项目类型
+     */
+    private Integer projectType;
+
+    /**
+     * 项目级别
+     */
+    private Integer projectLevel;
+
+    /**
+     * 项目状态
+     */
+    private Integer status;
+
+    /**
+     * 负责人ID
+     */
+    private Long leaderId;
+
+    /**
+     * 指导老师ID
+     */
+    private Long advisorId;
+
+    /**
+     * 学院
+     */
+    private String college;
+
+    /**
+     * 当前页
+     */
+    private Integer current = 1;
+
+    /**
+     * 每页大小
+     */
+    private Integer size = 10;
+}

backend/src/main/java/com/innovation/platform/dto/ProjectRequest.java

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+package com.innovation.platform.dto;
+
+import com.innovation.platform.entity.Project;
+import lombok.Data;
+import java.math.BigDecimal;
+import java.time.LocalDate;
+
+/**
+ * 项目请求 DTO
+ */
+@Data
+public class ProjectRequest {
+    private String projectNo;
+    
+    private String projectName;
+    
+    private Integer projectType;
+    
+    private Integer projectLevel;
+    
+    private Long leaderId;
+    
+    private Long advisorId;
+    
+    private String description;
+    
+    private String researchPlan;
+    
+    private String expectedResult;
+    
+    private String budget;
+    
+    private Integer status;
+    
+    private LocalDate startTime;
+    
+    private LocalDate endTime;
+    
+    private String college;
+
+    /**
+     * 转换为实体
+     */
+    public Project toEntity() {
+        Project project = new Project();
+        project.setProjectNo(this.projectNo);
+        project.setProjectName(this.projectName);
+        project.setProjectType(this.projectType);
+        project.setProjectLevel(this.projectLevel);
+        project.setLeaderId(this.leaderId);
+        project.setAdvisorId(this.advisorId);
+        project.setDescription(this.description);
+        project.setResearchPlan(this.researchPlan);
+        project.setExpectedResult(this.expectedResult);
+        if (this.budget != null && !this.budget.isEmpty()) {
+            project.setBudget(new BigDecimal(this.budget));
+        }
+        project.setStatus(this.status);
+        project.setStartTime(this.startTime);
+        project.setEndTime(this.endTime);
+        project.setCollege(this.college);
+        return project;
+    }
+}

backend/src/main/java/com/innovation/platform/dto/ProjectResponse.java

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+package com.innovation.platform.dto;
+
+import com.innovation.platform.entity.Project;
+import lombok.Builder;
+import lombok.Data;
+import java.math.BigDecimal;
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+
+/**
+ * 项目响应 DTO
+ */
+@Data
+@Builder
+public class ProjectResponse {
+    private Long id;
+    private String projectNo;
+    private String projectName;
+    private Integer projectType;
+    private Integer projectLevel;
+    private Long leaderId;
+    private String leaderName;
+    private Long advisorId;
+    private String advisorName;
+    private String description;
+    private String researchPlan;
+    private String expectedResult;
+    private BigDecimal budget;
+    private Integer status;
+    private LocalDate startTime;
+    private LocalDate endTime;
+    private String college;
+    private LocalDateTime createTime;
+    private LocalDateTime updateTime;
+
+    /**
+     * 从实体转换
+     */
+    public static ProjectResponse fromEntity(Project project) {
+        return ProjectResponse.builder()
+                .id(project.getId())
+                .projectNo(project.getProjectNo())
+                .projectName(project.getProjectName())
+                .projectType(project.getProjectType())
+                .projectLevel(project.getProjectLevel())
+                .leaderId(project.getLeaderId())
+                .advisorId(project.getAdvisorId())
+                .description(project.getDescription())
+                .researchPlan(project.getResearchPlan())
+                .expectedResult(project.getExpectedResult())
+                .budget(project.getBudget())
+                .status(project.getStatus())
+                .startTime(project.getStartTime())
+                .endTime(project.getEndTime())
+                .college(project.getCollege())
+                .createTime(project.getCreateTime())
+                .updateTime(project.getUpdateTime())
+                .build();
+    }
+}

backend/src/main/java/com/innovation/platform/mapper/ProjectMapper.java

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+package com.innovation.platform.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.innovation.platform.entity.Project;
+import org.apache.ibatis.annotations.Mapper;
+
+/**
+ * 项目 Mapper 接口
+ */
+@Mapper
+public interface ProjectMapper extends BaseMapper<Project> {
+}

backend/src/main/java/com/innovation/platform/service/ProjectService.java

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+package com.innovation.platform.service;
+
+import com.baomidou.mybatisplus.core.metadata.IPage;
+import com.innovation.platform.dto.ProjectQueryRequest;
+import com.innovation.platform.dto.ProjectRequest;
+import com.innovation.platform.dto.ProjectResponse;
+import com.innovation.platform.entity.Project;
+
+/**
+ * 项目服务接口
+ */
+public interface ProjectService {
+
+    /**
+     * 分页查询项目列表
+     */
+    IPage<ProjectResponse> page(ProjectQueryRequest request);
+
+    /**
+     * 根据ID查询项目详情
+     */
+    ProjectResponse getById(Long id);
+
+    /**
+     * 创建项目
+     */
+    Long create(ProjectRequest request);
+
+    /**
+     * 更新项目
+     */
+    void update(Long id, ProjectRequest request);
+
+    /**
+     * 删除项目
+     */
+    void delete(Long id);
+
+    /**
+     * 获取项目实体
+     */
+    Project getEntityById(Long id);
+}

backend/src/main/java/com/innovation/platform/service/impl/ProjectServiceImpl.java

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+package com.innovation.platform.service.impl;
+
+import cn.dev33.satoken.stp.StpUtil;
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.baomidou.mybatisplus.core.metadata.IPage;
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.innovation.platform.dto.ProjectQueryRequest;
+import com.innovation.platform.dto.ProjectRequest;
+import com.innovation.platform.dto.ProjectResponse;
+import com.innovation.platform.entity.Project;
+import com.innovation.platform.mapper.ProjectMapper;
+import com.innovation.platform.service.ProjectService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.beans.BeanUtils;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.util.StringUtils;
+
+/**
+ * 项目服务实现类
+ */
+@Service
+@RequiredArgsConstructor
+public class ProjectServiceImpl implements ProjectService {
+
+    private final ProjectMapper projectMapper;
+
+    @Override
+    public IPage<ProjectResponse> page(ProjectQueryRequest request) {
+        Page<Project> page = new Page<>(request.getCurrent(), request.getSize());
+        
+        LambdaQueryWrapper<Project> wrapper = new LambdaQueryWrapper<>();
+        wrapper.like(StringUtils.hasText(request.getProjectName()), Project::getProjectName, request.getProjectName())
+                .eq(request.getProjectType() != null, Project::getProjectType, request.getProjectType())
+                .eq(request.getProjectLevel() != null, Project::getProjectLevel, request.getProjectLevel())
+                .eq(request.getStatus() != null, Project::getStatus, request.getStatus())
+                .eq(request.getLeaderId() != null, Project::getLeaderId, request.getLeaderId())
+                .eq(request.getAdvisorId() != null, Project::getAdvisorId, request.getAdvisorId())
+                .eq(StringUtils.hasText(request.getCollege()), Project::getCollege, request.getCollege())
+                .orderByDesc(Project::getCreateTime);
+
+        IPage<Project> projectPage = projectMapper.selectPage(page, wrapper);
+        
+        return projectPage.convert(ProjectResponse::fromEntity);
+    }
+
+    @Override
+    public ProjectResponse getById(Long id) {
+        Project project = projectMapper.selectById(id);
+        if (project == null) {
+            throw new RuntimeException("项目不存在");
+        }
+        return ProjectResponse.fromEntity(project);
+    }
+
+    @Override
+    @Transactional(rollbackFor = Exception.class)
+    public Long create(ProjectRequest request) {
+        Project project = request.toEntity();
+        project.setStatus(project.getStatus() != null ? project.getStatus() : 0);
+        
+        // 设置创建人
+        Long userId = StpUtil.getLoginIdAsLong();
+        project.setCreateBy(userId);
+        project.setUpdateBy(userId);
+        
+        projectMapper.insert(project);
+        return project.getId();
+    }
+
+    @Override
+    @Transactional(rollbackFor = Exception.class)
+    public void update(Long id, ProjectRequest request) {
+        Project existingProject = projectMapper.selectById(id);
+        if (existingProject == null) {
+            throw new RuntimeException("项目不存在");
+        }
+
+        Project project = request.toEntity();
+        project.setId(id);
+        
+        // 设置更新人
+        Long userId = StpUtil.getLoginIdAsLong();
+        project.setUpdateBy(userId);
+        
+        // 保留原有的创建信息
+        project.setCreateBy(existingProject.getCreateBy());
+        project.setCreateTime(existingProject.getCreateTime());
+        
+        projectMapper.updateById(project);
+    }
+
+    @Override
+    @Transactional(rollbackFor = Exception.class)
+    public void delete(Long id) {
+        Project project = projectMapper.selectById(id);
+        if (project == null) {
+            throw new RuntimeException("项目不存在");
+        }
+        projectMapper.deleteById(id);
+    }
+
+    @Override
+    public Project getEntityById(Long id) {
+        return projectMapper.selectById(id);
+    }
+}