Add pre-commit hooks for linting and formatting

Set up pre-commit framework with ruff (backend) and ESLint/Prettier/tsc
(frontend) hooks to catch issues locally before CI. Auto-format all
frontend files with Prettier to comply with the new check.

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

frontend/src/hooks/usePokemon.ts

@@ -1,5 +1,10 @@
 import { useQuery } from '@tanstack/react-query'
-import { getPokemon, fetchPokemonFamilies, fetchPokemonEncounterLocations, fetchPokemonEvolutionChain } from '../api/pokemon'
+import {
+  getPokemon,
+  fetchPokemonFamilies,
+  fetchPokemonEncounterLocations,
+  fetchPokemonEvolutionChain,
+} from '../api/pokemon'
 
 export function usePokemon(id: number | null) {
   return useQuery({