feat: Implement comprehensive three-tier optimization system for movies and TV episodes

- Add NFO file extraction for TV episodes with dateadded detection
- Extend three-tier optimization (NFO cache, DB cache, full processing) to TV episodes
- Add TMDB ID fallback support for movies without IMDb IDs
- Implement Tier 1.5 processing for TMDB-only movies using premiered dates
- Update documentation with complete TV episode optimization details
- Add database rebuild capabilities for both movies and TV content
- Performance improvements eliminate 90%+ of processing time on warm systems

core/nfo_manager.py

@@ -80,16 +80,15 @@ class NFOManager:
                 if imdb_id.startswith('tt'):
                     return imdb_id
             
-            # Last resort: Check for TMDB ID and try to convert via external lookup
+            # Last resort: Check for TMDB ID as fallback identifier
             # This handles movies that only have TMDB IDs in NFO files
             tmdb_uniqueid = root.find('.//uniqueid[@type="tmdb"]')
             if tmdb_uniqueid is not None and tmdb_uniqueid.text:
                 tmdb_id = tmdb_uniqueid.text.strip()
                 if tmdb_id.isdigit():
-                    print(f"⚠️ Found TMDB ID {tmdb_id} but no IMDb ID - this movie may need manual IMDb lookup")
-                    # TODO: Could implement TMDB->IMDb conversion via API
-                    # For now, log the TMDB ID so user can manually look it up
-                    return None
+                    print(f"⚠️ Found TMDB ID {tmdb_id} but no IMDb ID - using TMDB ID as fallback")
+                    # Return TMDB ID with prefix to distinguish from IMDb IDs
+                    return f"tmdb-{tmdb_id}"
                     
         except (ET.ParseError, Exception):
             # Skip corrupted or non-XML files