test: Add comprehensive test coverage for critical modules
- Add tests for chat/encryption.js: encryption/decryption, hashing, token generation
- Add tests for chat/tokenManager.js: JWT tokens, device fingerprints, cookie handling
- Add tests for chat/prompt-sanitizer.js: security patterns, attack detection, obfuscation
- Add tests for admin panel: session management, rate limiting, user/token management
- Add tests for OpenCode write tool: file creation, overwrites, nested directories
- Add tests for OpenCode todo tools: todo CRUD operations
- Add tests for Console billing/account/provider: schemas, validation, price utilities
These tests cover previously untested critical paths including:
- Authentication and security
- Payment processing validation
- Admin functionality
- Model routing and management
- Account management
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