fix(test): exclude e2e tests from vitest and fix CI test suite

Playwright e2e tests were being collected by vitest in CI, causing
failures since Playwright isn't available in that context. Exclude
tests/e2e/** from vitest runs (e2e tests should run via pnpm test:e2e).

vitest.config.ts

@@ -14,6 +14,12 @@ export default defineConfig({
     globals: true,
     testTimeout: 30_000,
     hookTimeout: 30_000,
+    exclude: [
+      "tests/e2e/**",
+      "**/node_modules/**",
+      "**/dist/**",
+      "**/.{idea,git,cache,output,temp}/**",
+    ],
     // These env vars are injected into process.env BEFORE test files are
     // imported, ensuring apps/api/src/config.ts picks them up correctly.
     env: {