feat(backend): add complete FastAPI backend with production features

- FastAPI REST API with automatic OpenAPI docs
- Redis caching layer with hiredis for performance
- Supabase integration for data persistence
- Tree-sitter code parsing for Python/JavaScript
- OpenAI embeddings + Pinecone vector search
- Rate limiting and input validation middleware
- Performance metrics and monitoring
- Comprehensive test suite with pytest

Features:
- Semantic code search across repositories
- Dependency graph analysis
- Code style analysis and conventions
- Impact prediction for file changes
- Batch indexing with 100x performance improvement
- Incremental updates for active development

Tech: FastAPI + Redis + Supabase + Pinecone + OpenAI + Tree-sitter

Author: DevanshuNEU

backend/.env.example

@@ -0,0 +1,16 @@
+# API Keys
+OPENAI_API_KEY=your_openai_api_key_here
+PINECONE_API_KEY=your_pinecone_api_key_here
+PINECONE_INDEX_NAME=codeintel
+
+# Supabase
+SUPABASE_URL=https://your-project.supabase.co
+SUPABASE_KEY=your_supabase_anon_key_here
+
+# Backend API
+BACKEND_API_URL=http://localhost:8000
+API_KEY=dev-secret-key
+
+# Redis Cache
+REDIS_HOST=localhost
+REDIS_PORT=6379

backend/.gitignore

@@ -0,0 +1,34 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+venv/
+env/
+ENV/
+*.egg-info/
+.pytest_cache/
+.coverage
+
+# Environment variables
+.env
+.env.local
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Repos directory (cloned repositories)
+repos/
+!repos/.gitkeep
+
+# Cache
+*.log
+.cache/