* feat(server): make server host and port configurable
Support configuring server binding address via environment variables
and config files. Priority: ENV > local_config.yml > config.yml > default.
- Add host and port options to system section in config.yml
- Read SERVER_HOST and SERVER_PORT from environment variables
- Default to 127.0.0.1:8002 for security
Set host to "0.0.0.0" to allow LAN access.
* test(server): add comprehensive tests for server binding config
Add 28 test cases covering:
- Environment variable priority (SERVER_HOST, SERVER_PORT)
- Config file reading (system.host, system.port)
- Default value fallback
- OmegaConf integration
- Edge cases (IPv6, empty values, invalid ports)
* docs: add mobile/LAN access instructions
- Add mobile access section to README and EN_README
- Configure Vite to listen on 0.0.0.0 for LAN access in dev mode
- Link to Issue #130 for mobile UI compatibility tracking
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