fix: 修复部署问题

- 修复 RootController 返回 index.html
- 修复 MyBatis 缓存配置
- 修复 session scope bean 注入问题

src/main/java/com/example/scaffold/controller/RootController.java

@@ -1,13 +1,39 @@
 package com.example.scaffold.controller;
 
+import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.ResponseBody;
 
-@RestController
+import java.util.Map;
+
+@Controller
 public class RootController {
     
     @GetMapping("/")
-    public String root() {
-        return "Spring Boot Scaffold is running!";
+    public String index() {
+        return "forward:/index.html";
+    }
+    
+    @GetMapping("/api/status")
+    @ResponseBody
+    public Map<String, Object> status() {
+        return Map.of(
+            "message", "Spring Boot 学习脚手架运行中",
+            "pages", Map.of(
+                "首页", "/index.html",
+                "IoC学习", "/ioc.html",
+                "AOP学习", "/aop.html",
+                "MyBatis学习", "/mybatis.html",
+                "事务学习", "/transaction.html",
+                "用户管理", "/users.html",
+                "API测试", "/api.html"
+            ),
+            "apis", Map.of(
+                "用户API", "/api/users",
+                "产品API", "/api/products",
+                "订单API", "/api/orders",
+                "学习API", "/api/learning"
+            )
+        );
     }
 }

src/main/java/com/example/scaffold/learning/IocLearningController.java

@@ -32,9 +32,8 @@ public class IocLearningController {
     private final PerformanceAspect performanceAspect;
     
     // 演示字段注入（不推荐，但可以用）
-    @Autowired
-    @Qualifier("learningBean")
-    private LearningBean learningBean;
+    // 注意：session scope 的 bean 需要在 web 上下文中使用
+    // 这里仅作演示，实际使用时通过方法参数获取
     
     /**
      * 查看所有 Bean
@@ -100,7 +99,7 @@ public class IocLearningController {
             "prototype", "原型 - 每次请求都创建新实例",
             "request", "请求 - 每个 HTTP 请求一个实例",
             "session", "会话 - 每个 HTTP 会话一个实例",
-            "demo", learningBean.getInstanceInfo()
+            "tip", "session scope 需要在 web 请求上下文中使用"
         );
     }
     

src/main/java/com/example/scaffold/mapper/UserMapper.java

@@ -2,7 +2,7 @@ package com.example.scaffold.mapper;
 
 import com.example.scaffold.entity.User;
 import org.apache.ibatis.annotations.*;
-import org.apache.ibatis.cache.decorators.LruCache;
+import org.apache.ibatis.cache.impl.PerpetualCache;
 
 import java.util.List;
 
@@ -17,7 +17,7 @@ import java.util.List;
  * 5. @CacheNamespace - 二级缓存
  */
 @Mapper
-@CacheNamespace(implementation = LruCache.class, size = 1024)
+@CacheNamespace
 public interface UserMapper {
     
     /**