refactor: CSP nonce替代unsafe-inline, HSTS始终启用, router/api拆分, 管理后台+用户设置页拆分, DB健康降级, 时区配置, UID统一解析, CI接入

审计修复:
- CSP: unsafe-inline移除, nonce替代; unsafe-eval保留供Vditor使用
- HSTS: 始终启用(不再依赖release模式)
- Controller Exp: common.GetGinExp包装, 不再直接读context
- UID解析: common.ParseUIDParam统一, follow/admin controller改用

重构:
- router/api.go(198行)拆为7个域文件: auth/settings/posts/comments/reactions/social/studio
- 管理后台站点设置: 单页拆为4个子页(brand/security/registration/content)+子菜单
- 前台用户设置页: 1201行拆为6个独立模板+6个独立JS文件

新增:
- DB健康检测中间件(middleware/db_health.go): 5s ping+降级页面
- 时区配置: config.yaml server.timezone→time.Local初始化
- .gitea/workflows/ci.yml: strict模式CI流水线

internal/router/api_social.go

@@ -0,0 +1,64 @@
+package router
+
+import (
+	"metazone.cc/mce/internal/config"
+	"metazone.cc/mce/internal/middleware"
+
+	"github.com/gin-gonic/gin"
+)
+
+// setupSocialAPIRoutes 注册关注、收藏夹、空间相关 API 路由
+func setupSocialAPIRoutes(r *gin.Engine, cfg *config.Config, d *dependencies) {
+	// 关注 — 公开（Optional 认证）
+	followPublic := r.Group("/api/users/:uid")
+	followPublic.Use(d.authMdw.Optional())
+	{
+		followPublic.GET("/follow-status", d.followCtrl.GetStatus)
+		followPublic.GET("/followers", d.followCtrl.Followers)
+		followPublic.GET("/following", d.followCtrl.Following)
+	}
+	// 需登录：切换关注
+	followAPI := r.Group("/api/users/:uid")
+	followAPI.Use(d.authMdw.Required())
+	followAPI.Use(d.authMdw.BannedWriteGuard())
+	followAPI.Use(middleware.CSRF(cfg))
+	{
+		followAPI.POST("/follow", d.followCtrl.Toggle)
+	}
+
+	// 收藏夹 — 公开
+	r.GET("/api/posts/:id/folder-status", d.favoriteCtrl.GetPostStatus)
+	r.GET("/api/folders/:id/posts", d.favoriteCtrl.ListFolderItems)
+
+	// 收藏夹 — 需登录
+	folderAPI := r.Group("/api/folders")
+	folderAPI.Use(d.authMdw.Required())
+	folderAPI.Use(d.authMdw.BannedWriteGuard())
+	folderAPI.Use(middleware.CSRF(cfg))
+	{
+		folderAPI.GET("", d.favoriteCtrl.ListFolders)
+		folderAPI.POST("", d.favoriteCtrl.CreateFolder)
+		folderAPI.PUT("/:id", d.favoriteCtrl.UpdateFolder)
+		folderAPI.DELETE("/:id", d.favoriteCtrl.DeleteFolder)
+		folderAPI.POST("/:id/posts", d.favoriteCtrl.AddToFolder)
+		folderAPI.DELETE("/:id/posts/:postId", d.favoriteCtrl.RemoveFromFolder)
+	}
+
+	// 切换收藏 Toggle
+	favToggleAPI := r.Group("/api/posts/:id")
+	favToggleAPI.Use(d.authMdw.Required())
+	favToggleAPI.Use(d.authMdw.BannedWriteGuard())
+	favToggleAPI.Use(middleware.CSRF(cfg))
+	{
+		favToggleAPI.POST("/favorite", d.favoriteCtrl.ToggleFavorite)
+	}
+
+	// 空间/隐私设置
+	spaceAPI := r.Group("/api/space")
+	spaceAPI.Use(d.authMdw.Required())
+	spaceAPI.Use(d.authMdw.BannedWriteGuard())
+	spaceAPI.Use(middleware.CSRF(cfg))
+	{
+		spaceAPI.PUT("/privacy", d.spaceCtrl.UpdatePrivacy)
+	}
+}