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/services/render_blender.py

@@ -92,6 +92,8 @@ def render_still(
     log_callback: "Callable[[str], None] | None" = None,
     usd_path: "Path | None" = None,
     tessellation_engine: str = "occ",
+    focal_length_mm: float | None = None,
+    sensor_width_mm: float | None = None,
 ) -> dict:
     """Convert STEP → GLB (OCC or GMSH) → PNG (Blender subprocess).
 
@@ -179,6 +181,10 @@ def render_still(
                 logger.debug("[render_blender] usd_path active — mesh_attributes ignored")
         elif mesh_attributes:
             cmd += ["--mesh-attributes", json.dumps(mesh_attributes)]
+        if focal_length_mm is not None:
+            cmd += ["--focal-length", str(focal_length_mm)]
+        if sensor_width_mm is not None:
+            cmd += ["--sensor-width", str(sensor_width_mm)]
         return cmd
 
     def _run(eng: str) -> tuple[int, list[str], list[str]]:
@@ -311,8 +317,11 @@ def render_turntable_to_file(
     rotation_x: float = 0.0,
     rotation_y: float = 0.0,
     rotation_z: float = 0.0,
+    camera_orbit: bool = True,
     usd_path: "Path | None" = None,
     tessellation_engine: str = "occ",
+    focal_length_mm: float | None = None,
+    sensor_width_mm: float | None = None,
 ) -> dict:
     """Render a turntable animation: STEP → STL → N frames (Blender) → mp4 (ffmpeg).
 
@@ -391,8 +400,14 @@ def render_turntable_to_file(
         bg_color or "",
         "1" if transparent_bg else "0",
     ]
+    if camera_orbit:
+        cmd += ["--camera-orbit"]
     if use_usd:
         cmd += ["--usd-path", str(usd_path)]
+    if focal_length_mm is not None:
+        cmd += ["--focal-length", str(focal_length_mm)]
+    if sensor_width_mm is not None:
+        cmd += ["--sensor-width", str(sensor_width_mm)]
 
     log_lines: list[str] = []