Complete Task 1.3 - Authentication System Implementation

✅ Implemented comprehensive authentication system:
- Abstract AuthHandler base class with pluggable architecture
- APIKeyAuth for API key authentication (string auto-conversion)
- JWTAuth for JWT token authentication with expiration handling
- NoAuth for testing and public instances
- Full integration with WikiJSClient for automatic header management

🔧 Fixed packaging issues:
- Updated pyproject.toml with required project metadata fields
- Fixed utility function exports in utils/__init__.py
- Package now installs correctly in virtual environments

🧪 Validated with comprehensive tests:
- All authentication methods working correctly
- Proper error handling for invalid credentials
- Type validation and security features

📊 Progress: Phase 1 MVP Development now 60% complete
🎯 Next: Task 1.4 - Pages API implementation

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

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

wikijs/__init__.py

@@ -18,6 +18,7 @@ Features:
     - Context manager support for resource cleanup
 """
 
+from .auth import AuthHandler, NoAuth, APIKeyAuth, JWTAuth
 from .client import WikiJSClient
 from .exceptions import (
     WikiJSException,
@@ -41,6 +42,12 @@ __all__ = [
     # Main client
     "WikiJSClient",
     
+    # Authentication
+    "AuthHandler",
+    "NoAuth",
+    "APIKeyAuth", 
+    "JWTAuth",
+    
     # Data models
     "BaseModel",
     "Page",