Fix server persistence - now runs indefinitely serving requests
- Added ApiServer startup to main.rs to actually start HTTP/gRPC servers
- Updated default ports to match documentation (REST: 3000, gRPC: 50051)
- Added proper server startup logging with service URLs
- Server now persists and serves requests instead of exiting immediately
- Cleaned up unused imports in main.rs to reduce warnings
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Co-Authored-By: Claude <noreply@anthropic.com>