test(fmdapi): add mock infrastructure for unit tests

- Create capture script for recording live API responses
- Add mock-fetch utility for mocking global fetch in tests
- Reorganize tests: move E2E tests to tests/e2e/
- Create mock-based unit tests that don't require live FM server
- Update vitest config to exclude E2E tests by default
- Add test:e2e and capture scripts to package.json

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: eluce2

packages/fmdapi/package.json

@@ -44,7 +44,9 @@
     "format": "biome format --write .",
     "dev": "tsc --watch",
     "ci": "pnpm build && pnpm check-format && pnpm publint --strict && pnpm test",
-    "test": "doppler run -- vitest run",
+    "test": "vitest run",
+    "test:e2e": "doppler run -- vitest run tests/e2e",
+    "capture": "doppler run -- npx tsx scripts/capture-responses.ts",
     "typecheck": "tsc --noEmit",
     "changeset": "changeset",
     "release": "pnpm build && changeset publish --access public",