refactor: single-camera-per-process rtsp-camera node

[edgarriba]

Summary

• Refactor rtsp-camera from multi-camera-per-process to single-camera-per-process architecture
• Flatten Config struct (remove Vec<CameraConfig> wrapper), add validation with bounds checking
• Replace cameras_node binary with rtsp_camera_node following the system-telemetry CLI pattern (-c, -e)
• Add scoped health topic per instance: bubbaloop/{scope}/{machine}/health/rtsp-camera-{name}
• Add example per-camera configs (entrance.yaml, terrace.yaml)

Multi-Instance Support

Each camera runs as its own process with its own config file. Register multiple instances with the daemon:

bubbaloop node add ./rtsp-camera --name camera-entrance --config configs/entrance.yaml
bubbaloop node add ./rtsp-camera --name camera-terrace --config configs/terrace.yaml
bubbaloop node start camera-entrance
bubbaloop node start camera-terrace

Test plan

• Clean cargo build --release succeeds
• cargo test -- 9/9 pass (config parsing, validation, env override)
• Manual: register instance with daemon, verify independent start/stop/logs

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