chore: rename module from torrentclaw-cli to unarr

- Rename Go module path github.com/torrentclaw/torrentclaw-cli → github.com/torrentclaw/unarr
- Update all imports, ldflags, scripts, docs, and Docker config
- Add GitHub Actions release workflow (goreleaser on tag push)

docker-compose.yml

@@ -2,7 +2,7 @@ services:
   unarr:
     build:
       context: ..
-      dockerfile: torrentclaw-cli/Dockerfile
+      dockerfile: unarr/Dockerfile
     image: torrentclaw/unarr:latest
     container_name: unarr
     restart: unless-stopped