Introduce the Kotlin/Compose Android companion app and extend the TMDB proxy into a combo server that synchronizes the whole library as an encrypted snapshot, with all three components (Go server, Android, desktop) sharing one zero-knowledge crypto envelope and JSON schema. - server: add PostgreSQL-backed /sync/library (GET/PUT) with optimistic concurrency (revision + 409 on conflict); sync stays disabled unless DATABASE_URL is set. Add docker-compose with Postgres. - desktop: add libsodium CryptoEnvelope, LibrarySerializer and SyncClient; storage-mode and passphrase settings; a "Sync now" toolbar action with conflict resolution. - android: Room-backed library with local/cloud storage modes, encrypted sync client, and settings UI. The proxy server (URL + token) can be configured as a TMDB proxy even in local-only mode. Crypto is identical across platforms: Argon2id (libsodium crypto_pwhash, INTERACTIVE) + XChaCha20-Poly1305 in a versioned "UMTS" envelope, so a snapshot encrypted on one client decrypts on the other. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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