feat: per-position camera settings, material alias dialog, product delete, media browser links

- Per-render-position focal_length_mm/sensor_width_mm (DB → pipeline → Blender)
- FOV-based camera distance with min clamp fix for wide-angle lenses
- Unmapped materials blocking dialog on "Dispatch Renders" with batch alias creation
- Material check endpoint (GET /orders/{id}/check-materials)
- Batch alias endpoint (POST /materials/batch-aliases)
- Quick-map "No alias" badges on Materials page
- Full product hard-delete with storage cleanup (MinIO + disk files + orphaned CadFile)
- Delete button on ProductDetail page with confirmation
- Clickable product names in Media Browser (links to product page)
- Single-line render dispatch/retry (POST /orders/{id}/lines/{id}/dispatch-render)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/Dockerfile

@@ -16,8 +16,9 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     libffi-dev \
     && rm -rf /var/lib/apt/lists/*
 
-# Copy docker CLI for worker scaling
+# Copy docker CLI + compose plugin for worker scaling
 COPY --from=docker-cli /usr/local/bin/docker /usr/local/bin/docker
+COPY --from=docker-cli /usr/local/libexec/docker/cli-plugins/docker-compose /usr/local/libexec/docker/cli-plugins/docker-compose
 
 # Install Python dependencies (dev + cad extras: pytest, trimesh, pygltflib)
 COPY pyproject.toml .