test: add vitest

* feature(root): add vitest and some basic tests

* fix(test): after rebase + added referrars test and more sites

* fix(test): test broken after rebase

* fix(test): provide db url to make prisma happy

* fix tests

apps/api/package.json

@@ -6,7 +6,6 @@
     "testing": "API_PORT=3333 pnpm dev",
     "start": "node dist/index.js",
     "build": "rm -rf dist && tsup",
-    "gen:referrers": "jiti scripts/get-referrers.ts && biome format --write src/referrers/index.ts",
     "gen:bots": "jiti scripts/get-bots.ts && biome format --write src/bots/bots.ts",
     "typecheck": "tsc --noEmit"
   },