[Kamitoad]

Summary

• Add a Capacitor Android project that bundles the existing German React UI.
• Route Android capture, ChatGPT JSON import, receipt saves, history, and detail views to app-private SQLite and image storage, with no PC API dependency for core operations.
• Disable Android automatic cloud backup and document prototype limitations.

Verification

• pnpm check (31 tests passed)
• pnpm build and pnpm exec cap sync android passed
• Android SDK and a connected Samsung device are unavailable here, so APK compilation and real-device offline/restart tests have not run.

Remaining before release

• Build and test on the Samsung A52s 5G, including camera, process restart, airplane mode, interrupted writes, and storage failure.
• Implement and verify user-initiated backup export and restore; the app must not be the only copy of important receipts until then.
• Decide how to migrate existing server-side receipts to the phone.

Refs #12, #13