test(integration): add real-stack integration test suite with PGlite

- PGlite (in-memory WASM Postgres) hosted in a child process, exposed
  via TCP socket; real migrations applied with prisma migrate deploy
- Vitest harness (vitest.integration.config.ts, global-setup spawns
  PGlite + built Nuxt server, per-test TRUNCATE, factories, cookie-jar
  API client); no mocks, zero production code changes
- 50 tests across auth, hunt, team, submit, review, showcase, diashow
  incl. SuperJSON envelope check; *.itest.ts keeps bun test untouched
- CI: parallel unit + integration jobs in .github/workflows/test.yml
- tests/ covered by nuxt typecheck via tests/tsconfig.json reference

package.json

@@ -11,6 +11,7 @@
     "format": "prettier --write .",
     "check": "prettier --check .",
     "test": "bun test",
+    "test:integration": "vitest run -c vitest.integration.config.ts",
     "lint": "eslint .",
     "lint:fix": "eslint . --fix",
     "typecheck": "nuxt typecheck",
@@ -46,12 +47,15 @@
     "zod": "^4.4.3"
   },
   "devDependencies": {
+    "@electric-sql/pglite": "^0.5.5",
+    "@electric-sql/pglite-socket": "^0.2.8",
     "@nuxt/devtools": "^2.6.4",
     "@types/bun": "^1.2.20",
     "prettier": "^3.6.2",
     "prettier-plugin-organize-imports": "^4.2.0",
     "prettier-plugin-tailwindcss": "^0.6.14",
     "prisma": "^6.16.1",
+    "vitest": "^4.1.10",
     "vue-tsc": "^3.0.6"
   },
   "patchedDependencies": {