feat(admin): implement full admin dashboard structure

lib/routing/routes.go

@@ -16,6 +16,12 @@ type Handlers struct {
 	FileStatusUpdate   gin.HandlerFunc
 	DirectBoxUpload    gin.HandlerFunc
 	LegacyUpload       gin.HandlerFunc
+
+	AdminLogin     gin.HandlerFunc
+	AdminLoginPost gin.HandlerFunc
+	AdminLogout    gin.HandlerFunc
+	AdminDashboard gin.HandlerFunc
+	AdminAuth      gin.HandlerFunc
 }
 
 func Register(router *gin.Engine, handlers Handlers) {
@@ -36,4 +42,12 @@ func Register(router *gin.Engine, handlers Handlers) {
 	// Legacy upload routes are kept for compatibility with older clients.
 	router.POST("/box/:id/upload", handlers.DirectBoxUpload)
 	router.POST("/upload", handlers.LegacyUpload)
+
+	admin := router.Group("/admin")
+	admin.GET("/login", handlers.AdminLogin)
+	admin.POST("/login", handlers.AdminLoginPost)
+	admin.GET("/logout", handlers.AdminLogout)
+
+	protected := router.Group("/admin", handlers.AdminAuth)
+	protected.GET("/dashboard", handlers.AdminDashboard)
 }