fix(ci): keep deployable backend runtime-only

Sync only runtime dependencies in the backend deployable image and remove Renovate config options that the current Renovate release rejects.

.gitea/workflows/renovate.yml

@@ -229,10 +229,6 @@ jobs:
             prConcurrentLimit: 3,
             branchConcurrentLimit: 5,
 
-            // Logging
-            logLevel: 'info',
-            logFile: '/tmp/renovate.log',
-
             // Dry run mode for testing
             dryRun: process.env.RENOVATE_DRY_RUN === 'true'
           };

Dockerfile.backend

@@ -24,8 +24,8 @@ COPY backend/pyproject.toml backend/uv.lock* ./
 # requiring the file to pass through .dockerignore.
 RUN echo '# plex-playlist' > /README.md
 
-# Install dependencies
-RUN uv sync --frozen
+# Install runtime dependencies only
+RUN uv sync --frozen --no-dev
 
 # Copy application code
 COPY backend/ .