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/app/(dashboard)/dashboard/mitm/MitmPageClient.js

@@ -75,11 +75,7 @@ export default function MitmPageClient() {
   const mitmTools = Object.entries(MITM_TOOLS);
 
   return (
-    <div className="mx-auto flex w-full max-w-5xl flex-col gap-6 px-1 sm:px-0">
-      <div className="flex flex-col gap-1">
-        <h1 className="text-xl font-semibold text-text-main sm:text-2xl">MITM</h1>
-        <p className="text-sm text-text-muted">Route supported IDE traffic through 9Router with local DNS interception.</p>
-      </div>
+    <div className="flex w-full flex-col gap-6">
       {/* MITM Server Card */}
       <MitmServerCard
         apiKeys={apiKeys}