fix: ensure series loaded from DB before NFO scan

- Call _load_series_into_memory() before NFO scan phases to sync DB
  to SeriesApp memory, fixing missing NFO for recently resolved folders
- Add TMDB lookup for series without cached tmdb_id during NFO creation
- Add get_tmdb_client() factory and get_tmdb_image_base_url() helpers
- Fix: use get_tv_show_details instead of deprecated get_series_details
- Fix tests: mock _load_series_into_memory in NFO scan tests

src/server/services/initialization_service.py

@@ -541,6 +541,8 @@ async def perform_nfo_scan_if_needed(progress_service=None):
     
     # Execute the NFO scan
     try:
+        # Ensure any newly created series are loaded from DB into SeriesApp memory
+        await _load_series_into_memory(progress_service=None)
         await _execute_nfo_scan(progress_service)
         await _mark_nfo_scan_completed()
     except Exception as e:
@@ -615,6 +617,9 @@ async def perform_nfo_scan_phase(progress_service=None):
     
     # Execute the NFO scan
     try:
+        # Ensure any newly created series (e.g., from resolving unresolved folders)
+        # are loaded from DB into SeriesApp memory before scanning
+        await _load_series_into_memory(progress_service=None)
         await _execute_nfo_scan(progress_service)
         await _mark_nfo_scan_completed()