Add Android APK server

[emerypainchaud]

What

Add a Docker Compose service that builds the Android preview APK and serves it through Nginx.

Why

Provide a reproducible way to build and download the Android preview from a local web endpoint.

Impact

Run docker compose -f compose.android.yml up --build, then download the APK from port 8088.

Validation

• docker compose -f compose.android.yml config
• git diff --cached --check

Note

Add Android APK build server serving the T3 Code app over HTTP

• Adds a multi-stage Dockerfile that compiles the Android app using Node 24, Android SDK, and Gradle, producing a release APK for arm64-v8a.
• The runtime stage uses nginx to serve the APK at /t3-code-preview.apk with a download Content-Disposition header, alongside a minimal landing page.
• A new compose.android.yml defines the apk-server service, exposing port 8088 on the host.
• A .dockerignore excludes build artifacts, native dirs, and node_modules to reduce Docker build context size.

^{Macroscope summarized 154219a.}

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