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/models/game.py

@@ -14,6 +14,7 @@ class Game(Base):
     region: Mapped[str] = mapped_column(String(50))
     box_art_url: Mapped[str | None] = mapped_column(String(500))
     release_year: Mapped[int | None] = mapped_column(SmallInteger)
+    color: Mapped[str | None] = mapped_column(String(7))  # Hex color e.g. #FF0000
 
     routes: Mapped[list["Route"]] = relationship(back_populates="game")
     runs: Mapped[list["NuzlockeRun"]] = relationship(back_populates="game")