Validate and regenerate all seed data from PokeDB

- Regenerate seed JSON for all 37 games with more complete PokeDB data
- Add category field to games.json (original/enhanced/remake/sequel/spinoff)
- Include all 1350 pokemon in pokemon.json with types and local sprites
- Build reverse index for PokeDB form lookups (types/sprites for evolutions)
- Move sprites to frontend/public/sprites, reference as /sprites/{id}.webp
- Truncate Sw/Sh den names to fit DB VARCHAR(100) limit
- Deduplicate route names and merge unnamed child areas into parent routes
- Populate 7 previously empty games (Sw/Sh, BDSP, PLA, Sc/Vi)

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

.gitignore

@@ -64,6 +64,9 @@ temp/
 .pokeapi_cache/
 .pokedb_cache/
 
+# Generated sprites (downloaded by import-pokedb tool)
+frontend/public/sprites/
+
 # Go build output
 tools/fetch-pokeapi/fetch-pokeapi