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/run.py

@@ -21,7 +21,27 @@ from app.seeds.loader import (
 
 DATA_DIR = Path(__file__).parent / "data"
 
-GAME_FILES = ["firered", "leafgreen", "emerald", "heartgold", "soulsilver"]
+# All Gen 1-9 games
+GAME_FILES = [
+    # Gen 1
+    "red", "blue", "yellow",
+    # Gen 2
+    "gold", "silver", "crystal",
+    # Gen 3
+    "ruby", "sapphire", "emerald", "firered", "leafgreen",
+    # Gen 4
+    "diamond", "pearl", "platinum", "heartgold", "soulsilver",
+    # Gen 5
+    "black", "white", "black-2", "white-2",
+    # Gen 6
+    "x", "y", "omega-ruby", "alpha-sapphire",
+    # Gen 7
+    "sun", "moon", "ultra-sun", "ultra-moon", "lets-go-pikachu", "lets-go-eevee",
+    # Gen 8
+    "sword", "shield", "brilliant-diamond", "shining-pearl", "legends-arceus",
+    # Gen 9
+    "scarlet", "violet",
+]
 
 
 def load_json(filename: str) -> list[dict]: