chore: add msw init to prepare script

pnpm hardlinks msw from its global store after the first build, so
msw's postinstall doesn't re-run on subsequent installs — new clones
hitting a warm store would not get public/mockServiceWorker.js.

Run `msw init public --save` in the prepare script so every
`pnpm install` regenerates the worker deterministically.

Normalize workerDirectory to "public" to keep `--save` idempotent
(passing "./public" triggers msw to append both forms).

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

Author: devmgn

package.json

@@ -24,7 +24,8 @@
     "build-storybook": "storybook build",
     "generate-api": "pnpm dlx @openapitools/openapi-generator-cli generate -i openapi.yml -g typescript-fetch -o ./src/api/openapi -c openapiconfig.json --openapi-normalizer SET_TAGS_FOR_ALL_OPERATIONS=default",
     "generate-api:clean": "rm -rf src/api/openapi && pnpm generate-api",
-    "generate-mock": "msw-auto-mock openapi.yml -o ./src/mocks --typescript --base-url https://jsonplaceholder.typicode.com && sed -i '' 's|from \"@faker-js/faker\"|from \"@faker-js/faker/locale/ja\"|' ./src/mocks/handlers.ts"
+    "generate-mock": "msw-auto-mock openapi.yml -o ./src/mocks --typescript --base-url https://jsonplaceholder.typicode.com && sed -i '' 's|from \"@faker-js/faker\"|from \"@faker-js/faker/locale/ja\"|' ./src/mocks/handlers.ts",
+    "prepare": "msw init public --save"
   },
   "dependencies": {
     "@hookform/resolvers": "5.2.2",
@@ -103,6 +104,6 @@
     ]
   },
   "msw": {
-    "workerDirectory": "./public"
+    "workerDirectory": "public"
   }
 }