Improve logging, rate limiting, and error handling (#29)

* feat: apply local user changes and fixes

* ;D

* Clean up PR #28: Remove duplicate code lines and unnecessary file

- Remove pullrequest.md (PR notes file not needed in repo)
- Fix duplicate lines in account-manager.js:
  - rateLimitResetTime assignment
  - saveToDisk() calls in markRateLimited and markInvalid
  - invalidReason/invalidAt assignments
  - double return statement in discoverProject

Original PR by M2noa: fix sticky accs, 500s, logging updates, and rate limit handling

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

Co-Authored-By: M2noa <226494568+M2noa@users.noreply.github.com>
Co-Authored-By: Claude <noreply@anthropic.com>

* chore: replace console.log with logger methods for consistency

- Replace all console.log calls with logger.warn/debug in:
  - src/cloudcode-client.js (4 places)
  - src/format/thinking-utils.js (7 places)

This ensures consistent logging behavior with the new logger utility,
respecting --debug mode for verbose output.

🤖 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: M2noa <226494568+M2noa@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>

src/index.js

@@ -5,26 +5,54 @@
 
 import app from './server.js';
 import { DEFAULT_PORT } from './constants.js';
+import { logger } from './utils/logger.js';
+import path from 'path';
+import os from 'os';
+
+// Parse command line arguments
+const args = process.argv.slice(2);
+const isDebug = args.includes('--debug') || process.env.DEBUG === 'true';
+
+// Initialize logger
+logger.setDebug(isDebug);
+
+if (isDebug) {
+    logger.debug('Debug mode enabled');
+}
 
 const PORT = process.env.PORT || DEFAULT_PORT;
 
+// Home directory for account storage
+const HOME_DIR = os.homedir();
+const CONFIG_DIR = path.join(HOME_DIR, '.antigravity-claude-proxy');
+
 app.listen(PORT, () => {
-    console.log(`
+    // Clear console for a clean start
+    console.clear();
+
+    logger.log(`
 ╔══════════════════════════════════════════════════════════════╗
 ║           Antigravity Claude Proxy Server                    ║
 ╠══════════════════════════════════════════════════════════════╣
 ║                                                              ║
-║  Server running at: http://localhost:${PORT}                   ║
+║  Server running at: http://localhost:${PORT}                 ║
+║                                                              ║
+║  Control:                                                    ║
+║    --debug            Enable debug logging                   ║
+║    Ctrl+C             Stop server                            ║
 ║                                                              ║
 ║  Endpoints:                                                  ║
 ║    POST /v1/messages  - Anthropic Messages API               ║
 ║    GET  /v1/models    - List available models                ║
 ║    GET  /health       - Health check                         ║
-║    GET  /account-limits - Account status & quotas              ║
+║    GET  /account-limits - Account status & quotas            ║
 ║    POST /refresh-token - Force token refresh                 ║
 ║                                                              ║
+║  Configuration:                                              ║
+║    Storage: ${CONFIG_DIR}                                    ║
+║                                                              ║
 ║  Usage with Claude Code:                                     ║
-║    export ANTHROPIC_BASE_URL=http://localhost:${PORT}          ║
+║    export ANTHROPIC_BASE_URL=http://localhost:${PORT}        ║
 ║    export ANTHROPIC_API_KEY=dummy                            ║
 ║    claude                                                    ║
 ║                                                              ║
@@ -37,4 +65,9 @@ app.listen(PORT, () => {
 ║                                                              ║
 ╚══════════════════════════════════════════════════════════════╝
   `);
+    
+    logger.success(`Server started successfully on port ${PORT}`);
+    if (isDebug) {
+        logger.warn('Running in DEBUG mode - verbose logs enabled');
+    }
 });