Initial WatchLink scaffold

blueprint.md

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+# WatchLink
+
+WatchLink is a self-hosted shared-watch web app with persistent user rooms, local accounts, friends, role-based administration, and realtime playback state.
+
+{{ template:section-line }}
+
+## Features
+
+- First-run admin setup
+- Username/password accounts
+- Persistent user rooms
+- Friend graph and access modes
+- Shared playback state for YouTube, Twitch, and direct video URLs
+- Uptime Kuma/Dockge-inspired app shell
+- Dockerized Next.js and Postgres stack
+
+{{ template:section-line }}
+
+## Development
+
+```bash
+npm install
+cp .env.example .env
+npm run db:push
+npm run dev
+```
+
+{{ template:section-line }}
+
+## Docker
+
+```bash
+docker compose up --build
+```
+
+Target image: `git.wilkensxl.de/MrSphay/watchlink:latest`