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/types/game.ts

@@ -1,4 +1,9 @@
-export type GameCategory = 'original' | 'remake' | 'enhanced' | 'sequel' | 'spinoff'
+export type GameCategory =
+  | 'original'
+  | 'remake'
+  | 'enhanced'
+  | 'sequel'
+  | 'spinoff'
 
 export interface Game {
   id: number
@@ -14,8 +19,8 @@ export interface Game {
 }
 
 export interface GenlockeDefaults {
-  trueGenlocke: string  // game slug
-  normalGenlocke: string  // game slug
+  trueGenlocke: string // game slug
+  normalGenlocke: string // game slug
 }
 
 export interface Region {
@@ -163,7 +168,15 @@ export interface UpdateEncounterInput {
 }
 
 // Boss battles
-export type BossType = 'gym_leader' | 'elite_four' | 'champion' | 'rival' | 'evil_team' | 'kahuna' | 'totem' | 'other'
+export type BossType =
+  | 'gym_leader'
+  | 'elite_four'
+  | 'champion'
+  | 'rival'
+  | 'evil_team'
+  | 'kahuna'
+  | 'totem'
+  | 'other'
 
 export interface BossPokemon {
   id: number