fix(build): move the test db bootstrap under tests/

`.dockerignore` excludes `tests`, so the production build context carries
scripts/test-db-bootstrap.ts without the tests/setup/db-global module it
imports. tsconfig includes `**/*.ts`, so the `prebuild` typecheck fails on the
missing module and every deploy since the test suites landed has died there.
CI never saw it because tests/ exists on a runner.

The script is test-only, so it belongs in the tree that is already ignored.

scripts/test-db-bootstrap.ts

@@ -1,22 +0,0 @@
-/**
- * Builds the test database schema outside of Vitest.
- *
- * The `api` Vitest project gets this for free through its globalSetup, but the
- * end-to-end suite runs the real app against the same database and needs the
- * schema in place before the server starts. Both paths therefore call the same
- * setup function, so there is exactly one description of how a test database is
- * built (including why it uses `prisma db push` rather than `migrate deploy`,
- * which is documented at the top of tests/setup/db-global.ts).
- *
- * Usage: bun run test:db:bootstrap
- */
-import { setup } from '../tests/setup/db-global';
-
-setup()
-  .then(() => {
-    console.log('Test database schema is ready');
-  })
-  .catch((error: unknown) => {
-    console.error(error instanceof Error ? error.message : error);
-    process.exit(1);
-  });