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/api/genlockes.ts

@@ -1,5 +1,15 @@
 import { api } from './client'
-import type { Genlocke, GenlockeListItem, GenlockeDetail, GenlockeGraveyard, GenlockeLineage, CreateGenlockeInput, Region, SurvivorEncounter, AdvanceLegInput } from '../types/game'
+import type {
+  Genlocke,
+  GenlockeListItem,
+  GenlockeDetail,
+  GenlockeGraveyard,
+  GenlockeLineage,
+  CreateGenlockeInput,
+  Region,
+  SurvivorEncounter,
+  AdvanceLegInput,
+} from '../types/game'
 
 export function getGenlockes(): Promise<GenlockeListItem[]> {
   return api.get('/genlockes')
@@ -25,10 +35,20 @@ export function getGenlockeLineages(id: number): Promise<GenlockeLineage> {
   return api.get(`/genlockes/${id}/lineages`)
 }
 
-export function getLegSurvivors(genlockeId: number, legOrder: number): Promise<SurvivorEncounter[]> {
+export function getLegSurvivors(
+  genlockeId: number,
+  legOrder: number
+): Promise<SurvivorEncounter[]> {
   return api.get(`/genlockes/${genlockeId}/legs/${legOrder}/survivors`)
 }
 
-export function advanceLeg(genlockeId: number, legOrder: number, data?: AdvanceLegInput): Promise<Genlocke> {
-  return api.post(`/genlockes/${genlockeId}/legs/${legOrder}/advance`, data ?? {})
+export function advanceLeg(
+  genlockeId: number,
+  legOrder: number,
+  data?: AdvanceLegInput
+): Promise<Genlocke> {
+  return api.post(
+    `/genlockes/${genlockeId}/legs/${legOrder}/advance`,
+    data ?? {}
+  )
 }