Add all Gen 1-9 games with colors to seed data

- Add 37 games from Gen 1-9 (Red/Blue through Scarlet/Violet)
- Add color field to Game model matching box art/branding
- Add migration for games.color column
- Update fetch_pokeapi.py to fetch all games and output colors
- Update seed loader to upsert game colors
- Update frontend Game type to include color field

Games without PokeAPI encounter data (ORAS, Let's Go, Sword/Shield,
BDSP, Legends Arceus, Scarlet/Violet) have location structure but
empty encounter tables.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/src/app/seeds/loader.py

@@ -20,6 +20,7 @@ async def upsert_games(session: AsyncSession, games: list[dict]) -> dict[str, in
             generation=game["generation"],
             region=game["region"],
             release_year=game.get("release_year"),
+            color=game.get("color"),
         ).on_conflict_do_update(
             index_elements=["slug"],
             set_={
@@ -27,6 +28,7 @@ async def upsert_games(session: AsyncSession, games: list[dict]) -> dict[str, in
                 "generation": game["generation"],
                 "region": game["region"],
                 "release_year": game.get("release_year"),
+                "color": game.get("color"),
             },
         )
         await session.execute(stmt)