Implement FastAPI backend and Vue 3 frontend for Lowkey Backtest UI

- Added FastAPI backend with core API endpoints for strategies, backtests, and data management.
- Introduced Vue 3 frontend with a dark theme, enabling users to run backtests, adjust parameters, and compare results.
- Implemented Pydantic schemas for request/response validation and SQLAlchemy models for database interactions.
- Enhanced project structure with dedicated modules for services, routers, and components.
- Updated dependencies in `pyproject.toml` and `frontend/package.json` to include FastAPI, SQLAlchemy, and Vue-related packages.
- Improved `.gitignore` to exclude unnecessary files and directories.

live_trading/env.template

@@ -0,0 +1,15 @@
+# OKX API Credentials Template
+# Copy this file to .env and fill in your credentials
+# For demo trading, use your OKX demo account API keys
+# Generate keys at: https://www.okx.com/account/my-api (Demo Trading section)
+
+OKX_API_KEY=your_api_key_here
+OKX_SECRET=your_secret_key_here
+OKX_PASSWORD=your_passphrase_here
+
+# Demo Mode: Set to "true" for paper trading (sandbox)
+# Set to "false" for live trading with real funds
+OKX_DEMO_MODE=true
+
+# CryptoQuant API (optional, for on-chain features)
+CRYPTOQUANT_API_KEY=your_cryptoquant_api_key_here