Improve Android camera failure diagnostics

[bcbetterninja]

Android camera failures previously recorded only a generic Media3 error code, making failures such as ERROR_CODE_IO_UNSPECIFIED difficult to diagnose.

Include camera ID, stream selection, retry state, bounded nested exception types and stack locations, known network categories, and recognized RTSP method/status codes. Record startup failures, stalled or ended streams, reconnect timing, and recovery. Exclude arbitrary exception messages and stream URLs to protect credentials.

Validation: four Kotlin/JUnit diagnostic tests passed, covering credential exclusion, RTSP status filtering, cyclic/deep cause chains, and identifier validation. git diff --check passed. Full Android build and device validation remain pending because the local environment has no Android SDK.

[coderabbitai]

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