Populate boss Pokemon teams in seed data

Add Pokemon teams (pokeapi_id, level, order) to all 327 boss entries
across 21 seed files, sourced from Bulbapedia. Includes starter-dependent
teams via condition_label, Mega Evolution, Dynamax/Gigantamax,
Terastallize, and single-Pokemon entries for Totems/Nobles/Titans.
Also fix _export_bosses to include condition_label in exported data.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/src/app/seeds/run.py

@@ -544,6 +544,11 @@ async def _export_bosses(session: AsyncSession, vg_data: dict):
                         "pokemon_name": bp.pokemon.name,
                         "level": bp.level,
                         "order": bp.order,
+                        **(
+                            {"condition_label": bp.condition_label}
+                            if bp.condition_label
+                            else {}
+                        ),
                     }
                     for bp in sorted(b.pokemon, key=lambda p: p.order)
                 ],