fix: resolve NameError on startup, move analyses into recordings, remap port to 8050

- web.py: Python class bodies can't close over a name they also assign;
  use a temporary alias _analyses_dir to break the self-reference
- docker-compose.yml: mount ./recordings/analyses:/recordings/analyses
  instead of a separate ./analyses volume so cache lives inside recordings;
  remove --analyses-dir flag (default now resolves correctly); remap
  external port 8080→8050 for reverse proxy
- README.md / CLAUDE.md: update Docker port references to 8050

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -36,7 +36,7 @@ cp config.example.ini config.ini
 # edit config.ini to add your sources (no path changes needed for Docker)
 
 docker compose up -d
-# recorder starts immediately; web UI at http://<host>:8080
+# recorder starts immediately; web UI at http://<host>:8050
 docker compose logs -f            # tail logs from both services
 docker compose down               # graceful stop (waits up to 30 s for files to close)
 ```