Refactor global styles and enhance MITM functionality

- Updated global CSS to implement a new brand color palette and improve light/dark theme consistency.
- Enhanced the MitmServerCard component to provide clearer user feedback regarding admin privileges.
- Filtered LLM combos in the CombosPage to ensure only relevant data is displayed.
- Improved APIPageClient layout for better usability and visual consistency.
- Added functionality to save and load DNS tool states in the MITM manager.
- Updated OAuth configuration URLs for Qwen to reflect the new endpoint structure.
- Refined tunnel management logic to improve reliability and user experience.

src/lib/oauth/constants/oauth.js

@@ -57,8 +57,8 @@ export const GEMINI_CONFIG = {
 // Qwen OAuth Configuration (Device Code Flow with PKCE)
 export const QWEN_CONFIG = {
   clientId: "f0304373b74a44d2b584a3fb70ca9e56",
-  deviceCodeUrl: "https://qwen.ai/api/v1/oauth2/device/code",
-  tokenUrl: "https://qwen.ai/api/v1/oauth2/token",
+  deviceCodeUrl: "https://chat.qwen.ai/api/v1/oauth2/device/code",
+  tokenUrl: "https://chat.qwen.ai/api/v1/oauth2/token",
   scope: "openid profile email model.completion",
   codeChallengeMethod: "S256",
 };