feat(android): add Compose node app (bridge+canvas+chat+camera)

apps/android/README.md

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+## Clawdis Node (Android) (internal)
+
+Prototype Android “node” app (Iris parity): connects to the Gateway-owned bridge (`_clawdis-bridge._tcp`) over TCP and exposes Canvas + Chat + Camera.
+
+### Open in Android Studio
+- Open the folder `apps/android`.
+
+### Run
+- `./gradlew :app:installDebug`
+