feat: enhance OpenRouter model management with refresh functionality and Cloudflare bypass (fixes #3813, #3874)

[indiesewell]

Closes #3813
Closes #3874

🎯 Overview

This PR enhances OpenRouter integration by adding a model refresh button with comprehensive multilingual support and implementing a Cloudflare bypass solution for improved reliability.

🚀 Key Features

✨ Model Refresh Functionality

• Manual Refresh Button: Added a refresh button in OpenRouter settings to manually update model list
• Auto-initialization: Automatically initializes OpenRouter models on startup
• Smart Model Selection: If current model becomes unavailable after refresh, automatically selects the first available model
• Visual Feedback: Shows success/error messages with 3-second auto-dismiss

🌐 Multilingual Support

• Added refreshModels translation key across 16 languages:
  • English, Chinese (Simplified & Traditional), Japanese, Korean
  • Spanish, French, German, Italian, Portuguese (Brazil)
  • Dutch, Polish, Russian, Turkish, Vietnamese, Hindi

🔧 Technical Improvements

• Cloudflare Bypass: Implemented Node.js native https module to bypass Cloudflare blocking issues
• Enhanced Error Handling: Better error detection and user feedback for network issues
• Performance Optimization: Reduced redundant API calls with smart caching
• React Query Integration: Proper cache invalidation after model refresh

📁 Files Changed

• src/api/providers/fetchers/openrouter.ts - Added Cloudflare bypass logic
• webview-ui/src/components/settings/providers/OpenRouter.tsx - Added refresh button UI and logic
• webview-ui/src/i18n/locales/*/settings.json - Added translations for 16 languages
• src/core/webview/webviewMessageHandler.ts - Enhanced auto-initialization

🐛 Problem Solved

• Issue: Users couldn't refresh OpenRouter models without restarting the extension
• Issue: Cloudflare blocking prevented reliable model fetching
• Issue: No user feedback when model operations failed
• Issue: Missing multilingual support for new features

✅ Testing

• ✅ Manual refresh button works correctly
• ✅ Success/error messages display properly
• ✅ All 16 language translations verified
• ✅ Cloudflare bypass resolves connection issues
• ✅ Auto-model selection when current model unavailable

🔗 Related

Based on upstream v3.18.3 with proper Git merge to ensure compatibility.

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Important

Enhances OpenRouter with a model refresh button, multilingual support, and Cloudflare bypass, improving reliability and user feedback.

• Behavior:
  • Adds a refresh button in OpenRouter.tsx to manually update the model list with success/error messages.
  • Automatically initializes OpenRouter models on startup in webviewMessageHandler.ts.
  • Selects the first available model if the current model is unavailable after refresh.
• Multilingual Support:
  • Adds refreshModels translation key in 16 languages in locales/*/settings.json.
• Technical Improvements:
  • Implements Cloudflare bypass using Node.js https module in openrouter.ts.
  • Enhances error handling and user feedback for network issues.
  • Reduces redundant API calls with smart caching and React Query integration.
• Files Changed:
  • openrouter.ts: Cloudflare bypass logic.
  • OpenRouter.tsx: Refresh button UI and logic.
  • webviewMessageHandler.ts: Auto-initialization logic.

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