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/app/domains/pipeline/tasks/export_glb.py

@@ -95,9 +95,9 @@ def generate_gltf_geometry_task(self, cad_file_id: str):
             _cache_hit_asset_id = None
 
             # Composite cache key includes deflection settings so changing them invalidates cache
-            # v2: tessellation now happens after mm→m scaling (fixes destroyed tessellation)
+            # v3: removed BRepBuilderAPI_Transform, writer handles mm→m from STEP unit metadata
             effective_cache_key = (
-                f"v2:{_current_hash}:{linear_deflection}:{angular_deflection}:{tessellation_engine}"
+                f"v3:{_current_hash}:{linear_deflection}:{angular_deflection}:{tessellation_engine}"
                 if _current_hash else None
             )