TG Bot 命令交互 + UI 圆角色差深度优化 + 通知配置修复

## TG Bot 交互命令系统 (新增)
- telegram_bot.go: 命令路由 + /start /help /status /search /downloads /stats
- telegram_webhook.go: Webhook 接收 + Polling 管理端点
- Polling 模式: 无需公网 HTTPS, 服务器启动自动轮询
- HTML parse_mode 统一消息格式

## 通知配置 BUG 修复
- validateChannel 添加 email 类型支持
- 前后端字段统一: channel_type -> type
- ListByType 新增仓库方法

## UI 深度优化
- glass-panel: 添加 rounded-2xl + 可见边框 + padding
- card: 添加 p-4 sm:p-6
- 全局 rounded-md -> rounded-xl, 裸 rounded -> rounded-lg
- 500+ 深色硬编码类名清零
- text-gray-400 -> gray-500 色差提升
- 按钮组 flex-wrap 防溢出
- data-table 表格溢出截断

internal/handler/handler.go

@@ -20,6 +20,9 @@ func Register(r *gin.Engine, cfg *config.Config, log *zap.Logger, svc *service.C
 		api.GET("/health", healthCheck)
 		api.GET("/version", versionInfo)
 
+		// Telegram Bot webhook — called by Telegram servers, no auth.
+		api.POST("/telegram/webhook", telegramWebhookHandler(svc))
+
 		// Public auth.
 		auth := api.Group("/auth")
 		{
@@ -311,6 +314,12 @@ func Register(r *gin.Engine, cfg *config.Config, log *zap.Logger, svc *service.C
 			admin.DELETE("/notify/channels/:id", deleteNotifyChannelHandler(svc))
 			admin.POST("/notify/channels/:id/test", testNotifyChannelHandler(svc))
 
+			// Telegram Bot webhook management.
+			admin.GET("/telegram/webhook", telegramGetWebhookHandler(svc))
+			admin.POST("/telegram/webhook", telegramSetWebhookHandler(svc))
+			admin.POST("/telegram/polling/start", telegramStartPollingHandler(svc))
+			admin.POST("/telegram/polling/stop", telegramStopPollingHandler(svc))
+
 			// File organizer.
 			admin.POST("/media/:id/organize", organizeMediaHandler(svc))
 			admin.POST("/libraries/:id/organize", organizeLibraryHandler(svc))