debug: Add NFO creation debugging for Inside Out 2 issue

Added debug logging to understand why rich existing NFO metadata
isn't being preserved when NFOGuard updates files.

This will show:
- Parameters passed to create_movie_nfo
- Whether existing premiered dates are being preserved
- Why NFOGuard fields aren't being added to the bottom

This should help diagnose why Inside Out 2 NFO isn't getting
NFOGuard's dateadded and lockdata fields appended.

core/nfo_manager.py

@@ -143,6 +143,8 @@ class NFOManager:
         """Create or update movie.nfo file preserving existing content"""
         nfo_path = movie_dir / "movie.nfo"
         
+        print(f"🔍 create_movie_nfo called: imdb_id={imdb_id}, dateadded={dateadded}, released={released}, source={source}")
+        
         try:
             # Try to load existing NFO file
             if nfo_path.exists():
@@ -162,7 +164,10 @@ class NFOManager:
                         if existing is not None:
                             # Store the value before removing (for premiered/year)
                             if tag == "premiered" and not released:
+                                print(f"🔍 Preserving existing premiered date: {existing.text} (released was None)")
                                 released = existing.text  # Preserve existing premiered date
+                            elif tag == "premiered":
+                                print(f"🔍 NOT preserving premiered date: existing={existing.text}, released={released}")
                             movie.remove(existing)
                     
                     # Remove ALL existing uniqueid with type="imdb" regardless of attributes