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/schemas/game.py

@@ -17,6 +17,7 @@ class GameResponse(CamelModel):
     region: str
     box_art_url: str | None
     release_year: int | None
+    color: str | None
 
 
 class RouteWithChildrenResponse(RouteResponse):
@@ -37,6 +38,7 @@ class GameCreate(CamelModel):
     region: str
     box_art_url: str | None = None
     release_year: int | None = None
+    color: str | None = None
 
 
 class GameUpdate(CamelModel):
@@ -46,6 +48,7 @@ class GameUpdate(CamelModel):
     region: str | None = None
     box_art_url: str | None = None
     release_year: int | None = None
+    color: str | None = None
 
 
 class RouteCreate(CamelModel):