feat: Implement extension and bot limitations across services and UI (#1991)

- Added checks for maximum allowed extensions, bots, and pipelines in the backend services (PluginsRouterGroup, BotService, MCPService, PipelineService).
- Updated system configuration to include limitation settings for max_bots, max_pipelines, and max_extensions.
- Enhanced frontend components to handle limitations, providing user feedback when limits are reached.
- Added internationalization support for limitation messages in English, Japanese, Simplified Chinese, and Traditional Chinese.

web/src/i18n/locales/zh-Hant.ts

@@ -897,6 +897,14 @@ const zhHant = {
       sessions: '會話記錄',
     },
   },
+  limitation: {
+    maxBotsReached:
+      '已達到機器人數量上限（{{max}}個）。請先刪除已有機器人後再建立新的。',
+    maxPipelinesReached:
+      '已達到流水線數量上限（{{max}}個）。請先刪除已有流水線後再建立新的。',
+    maxExtensionsReached:
+      '已達到擴充功能數量上限（{{max}}個）。請先刪除已有的 MCP 伺服器或外掛後再新增。',
+  },
 };
 
 export default zhHant;