fix(fsm): Fix StateLog.by capture and cycle validation; add photographer field to photos

## FSM State Machine Fixes

### StateLog.by Field Capture
- Modified TransitionMethodFactory to pass 'user' as 'by' kwarg to enable
  django-fsm-log's @fsm_log_by decorator to correctly capture the user who
  performed the transition
- Applied fix to both escalate_transition and create_transition_method
- Uses exec() to dynamically create transition functions with correct __name__
  before decorators are applied, ensuring django-fsm's method registration works

### Cycle Validation Behavior
- Changed validate_no_cycles() to return ValidationWarning instead of ValidationError
- Cycles are now treated as warnings, not blocking errors, since cycles are often
  intentional in operational status FSMs (e.g., reopening after temporary closure)

### Ride Status Transitions
- Added TEMPORARY_CLOSURE -> OPERATING transition (reopen after temporary closure)
- Added SBNO -> OPERATING transition (revival - ride returns to operation)

## Field Parity

### Photo Models
- Added 'photographer' field to RidePhoto and ParkPhoto models
- Maps to frontend 'photographer_credit' field for full schema parity
- Includes corresponding migrations for both apps

### Serializers
- Added 'photographer' to RidePhotoSerializer and ParkPhotoSerializer read_only_fields

backend/apps/parks/models/media.py

@@ -43,6 +43,11 @@ class ParkPhoto(TrackedModel):
     )
 
     caption = models.CharField(max_length=255, blank=True, help_text="Photo caption or description")
+    photographer = models.CharField(
+        max_length=200,
+        blank=True,
+        help_text="Photographer credit (maps to frontend photographer_credit)"
+    )
     alt_text = models.CharField(max_length=255, blank=True, help_text="Alternative text for accessibility")
     is_primary = models.BooleanField(default=False, help_text="Whether this is the primary photo for the park")
     is_approved = models.BooleanField(default=False, help_text="Whether this photo has been approved by moderators")