fix: remove rate-limited REST fallback, explicitly install SpotipyFree

The curl_cffi fallback in spotify_resolve.py was silently catching
SpotipyFree ImportErrors and hitting api.spotify.com/v1/ directly —
the same rate-limited endpoint. Removed it entirely.

Also explicitly pip-install SpotipyFree before TzurSoffer's package
so the import is always available regardless of dependency resolution.

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

docker-compose.yml

@@ -34,7 +34,7 @@ services:
       sh -c "
         apt-get update && apt-get install -y --no-install-recommends python3 python3-pip ffmpeg curl git && rm -rf /var/lib/apt/lists/* &&
         curl -sL https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp -o /usr/local/bin/yt-dlp && chmod a+rx /usr/local/bin/yt-dlp &&
-        pip install --break-system-packages 'git+https://github.com/TzurSoffer/spotify-downloader' &&
+        pip install --break-system-packages SpotipyFree 'git+https://github.com/TzurSoffer/spotify-downloader' &&
         mkdir -p /deps && cd /deps && npm install express &&
         cd /app && NODE_PATH=/deps/node_modules node novasonic-server.js
       "