Fix JSON parsing in NFO JavaScript modules

- Add response.json() calls in nfo-manager.js for all API calls
- Add response.json() calls in nfo-config.js for all API calls
- Fix createNFO, refreshNFO, viewNFO, getSeriesWithoutNFO functions
- Fix load and testTMDBConnection functions
- All API responses must be parsed before accessing properties

docs/instructions.md

@@ -132,12 +132,15 @@ All tasks completed! Recent issues have been resolved.
 **Solution:** Modified `get_nfo_service()` dependency function to check `settings.tmdb_api_key` first, and if not found, fall back to loading from `config.json` directly. This ensures the TMDB API key is always available even after hot reloads in development.
 
 **Files Modified:**
+
 - [src/server/api/nfo.py](../src/server/api/nfo.py)
 
 **Tests Added:**
+
 - [tests/unit/test_nfo_dependency.py](../tests/unit/test_nfo_dependency.py) - Tests for config fallback behavior
 
-**Verification:** 
+**Verification:**
+
 - All 4 unit tests pass
 - NFO endpoints work correctly even after server reloads
 - Falls back gracefully to config.json when settings are reset