feat: make login land on protected portal

web/WEB-INF/views/index.jsp

@@ -155,7 +155,7 @@
             <div class="lang-warning" id="heroWarning">登录后才能看到完整课程导航与实验入口。</div>
             <div class="hero-actions">
                 <a class="btn" href="dashboard.action" id="heroActionPrimary">进入仪表盘</a>
-                <a class="btn-soft" href="loginPage.action" id="heroActionSecondary">立即登录</a>
+                <a class="btn-soft" href="logout.action" id="heroActionSecondary">退出登录</a>
                 <button class="btn-ghost" type="button" id="languageBtnHero">EN</button>
             </div>
             <div class="session-note" id="heroSessionNote">
@@ -240,10 +240,10 @@
                     text: {
                         heroEyebrow: "Struts2 学习门户",
                         heroTitle: "登录之后才能继续学习",
-                        heroDesc: "所有入口都由 Session + AuthInterceptor 保护，未登录将自动跳回登录页。",
-                        heroWarning: "未登录不能访问实验页；登录后可畅玩全部模块。",
+                        heroDesc: "所有入口都由 Session + AuthInterceptor 保护，未登录将自动跳回登录页；登录成功后会先回到这个统一门户。",
+                        heroWarning: "当前门户本身也在登录保护之下，适合用来总览各实验模块。",
                         heroActionPrimary: "进入仪表盘",
-                        heroActionSecondary: "立即登录",
+                        heroActionSecondary: "退出登录",
                         portalEyebrow: "学习模块导航",
                         portalTitle: "分步骤理解 Struts2",
                         portalDesc: "每个 `.action` 路径都在登录后才能访问，Session 鉴权串联整个体验。",
@@ -262,10 +262,10 @@
                     text: {
                         heroEyebrow: "Struts2 Learning Portal",
                         heroTitle: "Login before you explore",
-                        heroDesc: "All modules are protected by Session + AuthInterceptor. Unauthenticated access goes back to login.",
-                        heroWarning: "Access denied until login; dashboard and labs available after authentication.",
+                        heroDesc: "All modules are protected by Session + AuthInterceptor. After login, this protected portal becomes the unified entry.",
+                        heroWarning: "The portal itself is protected and serves as the overview for every lab module.",
                         heroActionPrimary: "Go to dashboard",
-                        heroActionSecondary: "Login now",
+                        heroActionSecondary: "Log out",
                         portalEyebrow: "Module guide",
                         portalTitle: "Step-by-step Struts2",
                         portalDesc: "Every `.action` route sits behind login; the session chain secures the experience.",