feat: Refactor LLM router and integrate health check endpoint

- Simplified LLM call logic in llm_router.py, removing tool adapter complexity and enhancing error handling.
- Added health check endpoint to main.py for system status verification.
- Cleaned up router.py by removing unused imports and commented-out code, streamlining the structure.
- Updated docker-compose.yml to unify services under a single Lyra container, enhancing deployment simplicity.
- Created Dockerfile for unified container setup, including both Relay and Cortex services.
- Added QUICKSTART.md for improved onboarding and usage instructions.
- Implemented start.sh script to manage service startup and health checks.

.dockerignore

@@ -0,0 +1,52 @@
+# Git
+.git
+.gitignore
+
+# Docker
+docker-compose.yml
+Dockerfile*
+
+# Python
+__pycache__
+*.pyc
+*.pyo
+*.pyd
+.Python
+*.so
+*.egg
+*.egg-info
+dist
+build
+.venv
+venv
+
+# Node
+node_modules
+npm-debug.log
+yarn-error.log
+
+# IDE
+.vscode
+.idea
+*.swp
+*.swo
+
+# Logs
+*.log
+logs
+
+# Environment
+.env.local
+.env.*.local
+
+# Backup directories
+*-old
+*-backup*
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Temp
+*.tmp
+tmp