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/format/content-converter.js

@@ -5,6 +5,7 @@
 
 import { MIN_SIGNATURE_LENGTH, GEMINI_SKIP_SIGNATURE } from '../constants.js';
 import { getCachedSignature } from './signature-cache.js';
+import { logger } from '../utils/logger.js';
 
 /**
  * Convert Anthropic role to Google role
@@ -101,7 +102,7 @@ export function convertContentToParts(content, isClaudeModel = false, isGeminiMo
                 if (!signature && block.id) {
                     signature = getCachedSignature(block.id);
                     if (signature) {
-                        console.log('[ContentConverter] Restored signature from cache for:', block.id);
+                        logger.debug(`[ContentConverter] Restored signature from cache for: ${block.id}`);
                     }
                 }