Selective fixes from PR #35: Model-specific rate limits & robustness improvements (#37)

* feat: apply local user changes and fixes

* ;D

* Implement OpenAI support, model-specific rate limiting, and robustness fixes

* docs: update pr title

* feat: ensure unique openai models endpoint

* fix: startup banner alignment and removed duplicates

* feat: add model fallback system with --fallback flag

* fix: accounts cli hanging after completion

* feat: add exit option to accounts cli menu

* fix: remove circular dependency warning for fallback flag

* feat: show active modes in banner and hide their flags

* Remove OpenAI compatibility and fallback features from PR #35

Cherry-picked selective fixes from PR #35 while removing:
- OpenAI-compatible API endpoints (/openai/v1/*)
- Model fallback system (fallback-config.js)
- Thinking block skip for Gemini models
- Unnecessary files (pullrequest.md, test-fix.js, test-openai.js)

Retained improvements:
- Network error handling with retry logic
- Model-specific rate limiting
- Enhanced health check with quota info
- CLI fixes (exit option, process.exit)
- Startup banner alignment (debug mode only)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* banner alignment fix

* Refactor: Model-specific rate limits and cleanup deprecated code

- Remove global rate limit fields (isRateLimited, rateLimitResetTime) in favor of model-specific limits (modelRateLimits[modelId])
- Remove deprecated wrapper functions (is429Error, isAuthInvalidError) from handlers
- Filter fetchAvailableModels to only return Claude and Gemini models
- Fix getCurrentStickyAccount() to pass model param after waiting
- Update /account-limits endpoint to show model-specific limits
- Remove multi-account OAuth flow to avoid state mismatch errors

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* fix: show (x/y) limited status in account-limits table

- Status is now "ok" only when all models are available
- Shows "(x/y) limited" when x out of y models are exhausted
- Provides better visibility into partial rate limiting

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* docs: update CLAUDE.md with model-specific rate limiting

- Document modelRateLimits[modelId] for per-model rate tracking
- Add isNetworkError() helper to utilities section

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

---------

Co-authored-by: M1noa <minoa@minoa.cat>
Co-authored-by: Minoa <altgithub@minoa.cat>
Co-authored-by: Claude <noreply@anthropic.com>

src/index.js

@@ -30,29 +30,47 @@ app.listen(PORT, () => {
     // Clear console for a clean start
     console.clear();
 
+    const border = '║';
+    // align for 2-space indent (60 chars), align4 for 4-space indent (58 chars)
+    const align = (text) => text + ' '.repeat(Math.max(0, 60 - text.length));
+    const align4 = (text) => text + ' '.repeat(Math.max(0, 58 - text.length));
+    
+    // Build Control section dynamically
+    let controlSection = '║  Control:                                                    ║\n';
+    if (!isDebug) {
+        controlSection += '║    --debug            Enable debug logging                   ║\n';
+    }
+    controlSection += '║    Ctrl+C             Stop server                            ║';
+
+    // Build status section if debug mode is active
+    let statusSection = '';
+    if (isDebug) {
+        statusSection = '║                                                              ║\n';
+        statusSection += '║  Active Modes:                                               ║\n';
+        statusSection += '║    ✓ Debug mode enabled                                      ║\n';
+    }
+
     logger.log(`
 ╔══════════════════════════════════════════════════════════════╗
 ║           Antigravity Claude Proxy Server                    ║
 ╠══════════════════════════════════════════════════════════════╣
 ║                                                              ║
-║  Server running at: http://localhost:${PORT}                 ║
-║                                                              ║
-║  Control:                                                    ║
-║    --debug            Enable debug logging                   ║
-║    Ctrl+C             Stop server                            ║
+${border}  ${align(`Server running at: http://localhost:${PORT}`)}${border}
+${statusSection}║                                                              ║
+${controlSection}
 ║                                                              ║
 ║  Endpoints:                                                  ║
-║    POST /v1/messages  - Anthropic Messages API               ║
-║    GET  /v1/models    - List available models                ║
-║    GET  /health       - Health check                         ║
-║    GET  /account-limits - Account status & quotas            ║
-║    POST /refresh-token - Force token refresh                 ║
+║    POST /v1/messages         - Anthropic Messages API        ║
+║    GET  /v1/models           - List available models         ║
+║    GET  /health              - Health check                  ║
+║    GET  /account-limits      - Account status & quotas       ║
+║    POST /refresh-token       - Force token refresh           ║
 ║                                                              ║
-║  Configuration:                                              ║
-║    Storage: ${CONFIG_DIR}                                    ║
+${border}  ${align(`Configuration:`)}${border}
+${border}    ${align4(`Storage: ${CONFIG_DIR}`)}${border}
 ║                                                              ║
 ║  Usage with Claude Code:                                     ║
-║    export ANTHROPIC_BASE_URL=http://localhost:${PORT}        ║
+${border}    ${align4(`export ANTHROPIC_BASE_URL=http://localhost:${PORT}`)}${border}
 ║    export ANTHROPIC_API_KEY=dummy                            ║
 ║    claude                                                    ║
 ║                                                              ║