feat: Complete Google Search Console integration with Clerk authentication

- Add GSC API service with OAuth2 authentication
- Implement Clerk authentication for frontend and backend
- Add GSC login button and OAuth callback handling
- Create comprehensive GSC data fetching and caching
- Add authentication middleware for backend API protection
- Implement real-time GSC data integration in SEO dashboard
- Add user-specific GSC site management
- Include comprehensive logging and error handling
- Add TypeScript support and proper type definitions
- Create environment templates and setup documentation
- Update gitignore to exclude sensitive credential files

Features added:
- GSC OAuth2 authentication flow
- Real-time search analytics data
- Site list management
- Sitemap analysis
- User-specific data isolation
- Comprehensive error handling
- Authentication token management
- Popup-based OAuth flow
- Data caching and refresh mechanisms

Note: gsc_credentials.json should be created locally with your Google OAuth credentials

frontend/env_template.txt

@@ -0,0 +1,18 @@
+# Clerk Authentication
+NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY=your_clerk_publishable_key_here
+
+# CopilotKit
+REACT_APP_COPILOTKIT_API_KEY=your_copilotkit_api_key_here
+# ALwrity Frontend Configuration
+# Clerk Authentication
+REACT_APP_CLERK_PUBLISHABLE_KEY=pk_test_bGl2aW5nLWhhbXN0ZXItNTkuY2xlcmsuYWNjb3VudHMuZGV2JA
+
+# CopilotKit Configuration
+REACT_APP_COPILOTKIT_API_KEY=ck_pub_98fb2df734ffb1f160ae1ab731ccbfed
+
+# LinkedIn OAuth Configuration
+REACT_APP_LINKEDIN_CLIENT_ID=your_linkedin_client_id_here
+REACT_APP_LINKEDIN_REDIRECT_URI=http://localhost:3000/auth/linkedin/callback
+
+# Backend API
+REACT_APP_API_BASE_URL=http://localhost:8000