Jul 29 - Photo absolute media URLs for mobile; add photo retention purge

app/api/inspections.py

@@ -96,6 +96,13 @@ def _parse_datetime(value):
     return None
 
 
+def _media(key):
+    """Absolute display URL for a storage key (presigned on R2, absolute-static
+    on local). '' for falsy keys. Used for iPad image rendering."""
+    from app.utils import storage
+    return storage.media_url(key, external=True) if key else ''
+
+
 def _inspection_payload(inspection):
     """Serialize an Inspection to the dict returned in API responses."""
     # Extract form responses from the notes JSON blob.
@@ -137,6 +144,14 @@ def _inspection_payload(inspection):
                                  if inspection.completed_at else None,
         'mobile_local_id':       inspection.mobile_local_id,
         'form_data':             form_data,
+        # Absolute display URLs for image form fields (presigned on R2,
+        # absolute-static on local): {field_id: url}. The iPad prefers this
+        # over building ServerConfig + /static/ + value.
+        'form_media':            {
+                                    fid: _media(v)
+                                    for fid, v in (form_data or {}).items()
+                                    if isinstance(v, str) and v.startswith('uploads/')
+                                 },
         'form_schema':           form_schema,
         'inspector_notes':       inspector_notes,
         # ── Follow-up / re-inspection fields ──────────────────────────────