debug: Add IMDb ID detection logging and database-first optimization

Added comprehensive debugging for IMDb ID detection to identify issues
with directories that don't have IMDb IDs in folder names but do have
them in filenames (like Adulthood (2025) [tt26657977]).

Also added database-first optimization that skips expensive API calls
when we already have complete data in the database. This should:
- Speed up full rescans significantly
- Reduce unnecessary API calls to TMDB/OMDB/Radarr
- Keep database size appropriate by not re-querying known movies

This should resolve both the small database size issue and improve
performance for movies that already have valid dateadded entries.

core/nfo_manager.py

@@ -88,9 +88,12 @@ class NFOManager:
     
     def find_movie_imdb_id(self, movie_dir: Path) -> Optional[str]:
         """Find IMDb ID from directory name, filenames, or NFO file"""
+        print(f"🔍 Searching for IMDb ID in: {movie_dir.name}")
+        
         # First try directory name
         imdb_id = self.parse_imdb_from_path(movie_dir)
         if imdb_id:
+            print(f"✅ Found IMDb ID in directory name: {imdb_id}")
             return imdb_id
             
         # Try all files in the directory for IMDb ID patterns
@@ -98,15 +101,17 @@ class NFOManager:
             if file_path.is_file():
                 imdb_id = self.parse_imdb_from_path(file_path)
                 if imdb_id:
+                    print(f"✅ Found IMDb ID in filename: {imdb_id} from {file_path.name}")
                     return imdb_id
                     
         # Finally, try NFO file content
         nfo_path = movie_dir / "movie.nfo"
         imdb_id = self.parse_imdb_from_nfo(nfo_path)
         if imdb_id:
-            print(f"🔍 Found IMDb ID in NFO file: {imdb_id} from {nfo_path}")
+            print(f"✅ Found IMDb ID in NFO file: {imdb_id} from {nfo_path}")
             return imdb_id
             
+        print(f"❌ No IMDb ID found in directory, filenames, or NFO for: {movie_dir.name}")
         return None
     
     def _parse_nfo_with_tolerance(self, nfo_path: Path):