Fix Linux pairing with isolated shin app and OBS plugin

[YashasVM]

Summary

• ship a matched shin Android app and Linux OBS source with isolated package, module, source, URI, discovery, and port identities
• send phone discovery directly to the selected OBS host in addition to broadcast and multicast
• report Paired only after OBS acknowledges /reserve
• remove the OBS dock and its frontend and Widgets dependencies, which removes the reproduced shutdown crash path
• add an atomic Linux installer and a bounded synthetic phone probe

Verification

• ./gradlew testDebugUnitTest assembleDebug
• python -m pytest -q (93 passed)
• ./build_plugin_linux.sh --install-user (5 C++ tests passed)
• installed OBS 32.2.2 discovered and reserved a synthetic phone, received H.264 plus AAC over SRT, emitted decoded frames, released the reservation, and exited without a new core dump

The local APK is artifacts/shin-android-debug.apk. ADB had no connected Android device, so the APK was built but not sideloaded.

[coderabbitai]

Important

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Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: c2b87c4c-a9cc-464d-9ccb-bfb72b92f7dc

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[YashasVM]

Yashas's code review bot: The Linux-focused pairing/crash work is well validated, and Android, Linux OBS, and Website checks pass. However, the exact PR head still fails the Windows OBS Build plugin package step; all downstream Windows contract/behavioral tests, ABI checks, package verification, installer build, and installer smoke test are consequently skipped. Because this PR changes the shared OBS plugin identity/build/package surface, I would not merge until the Windows build is restored and its downstream validation runs successfully. I found no additional high-confidence blocker in the reviewed Linux/Android changes.