Seed all Pokemon species and add admin pagination

- Update fetch_pokeapi.py to import all 1025 Pokemon species instead of
  only those appearing in encounters
- Add paginated response for /pokemon endpoint with total count
- Add pagination controls to AdminPokemon page (First/Prev/Next/Last)
- Show current page and total count in admin UI
- Add bean for Pokemon forms support task
- Update UX improvements bean with route grouping polish item

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

backend/src/app/schemas/pokemon.py

@@ -11,6 +11,13 @@ class PokemonResponse(CamelModel):
     sprite_url: str | None
 
 
+class PaginatedPokemonResponse(CamelModel):
+    items: list[PokemonResponse]
+    total: int
+    limit: int
+    offset: int
+
+
 class EvolutionResponse(CamelModel):
     id: int
     from_pokemon_id: int