fix: Ensure NFOGuard fields are appended at bottom of NFO files

Changed from ET.SubElement() to ET.Element() + explicit append() to
guarantee that NFOGuard-managed fields appear at the very bottom of
NFO files after all existing content.

This is critical because:
- Emby plugin specifically looks for dateadded field
- All NFOGuard fields should be grouped together at the bottom
- Preserves existing rich metadata while clearly marking our additions

Added debug logging for dateadded field to confirm it's being written.

core/nfo_manager.py

@@ -183,36 +183,42 @@ class NFOManager:
                 # Create new NFO structure
                 movie = ET.Element("movie")
             
-            # Now append ALL NFOGuard and date fields at the VERY END of the file
+            # Now append ALL NFOGuard fields at the VERY END of the file
-            # This ensures they appear after all existing content including actors
+            # Create elements and explicitly append them to ensure they're at the bottom
             
             # Add IMDb uniqueid at the end (after all existing content)
-            uniqueid = ET.SubElement(movie, "uniqueid", type="imdb", default="true")
+            uniqueid = ET.Element("uniqueid", type="imdb", default="true")
             uniqueid.text = imdb_id
+            movie.append(uniqueid)
             
             # Add premiered date at the bottom if we have it
             if released:
-                premiered_elem = ET.SubElement(movie, "premiered")
+                premiered_elem = ET.Element("premiered")
                 premiered_elem.text = released[:10] if len(released) >= 10 else released
+                movie.append(premiered_elem)
                 
                 # Extract year from premiered date for consistency
                 try:
                     year_value = released[:4] if len(released) >= 4 else None
                     if year_value and year_value.isdigit():
-                        year_elem = ET.SubElement(movie, "year")
+                        year_elem = ET.Element("year")
                         year_elem.text = year_value
+                        movie.append(year_elem)
                 except:
                     pass  # Skip year if we can't extract it
             
-            # Add dateadded at the end
+            # Add dateadded at the end - THIS IS CRITICAL FOR EMBY PLUGIN
             if dateadded:
-                dateadded_elem = ET.SubElement(movie, "dateadded")
+                dateadded_elem = ET.Element("dateadded")
                 dateadded_elem.text = dateadded
+                movie.append(dateadded_elem)
+                print(f"✅ Added dateadded to NFO: {dateadded}")
             
             # Add lockdata at the very end
             if lock_metadata:
-                lockdata = ET.SubElement(movie, "lockdata")
+                lockdata = ET.Element("lockdata")
                 lockdata.text = "true"
+                movie.append(lockdata)
             
             # Add NFOGuard comment at the beginning
             comment_text = f" Created by {self.manager_brand} - Source: {source} "