fix: make test suite runnable without DB/Chrome, add tests to CI

- Refactor index.ts to skip start() when NODE_ENV=test
- Add test setup with mocks for db, keys, browser, verification, email, usage
- Add vitest.config.ts with setup file
- Rewrite tests to work with mocks (42 tests, all passing)
- Add new tests: signup 410, recovery validation, CORS headers, error format, API root
- Add test step to CI pipeline before Docker build

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "docfast-api",
-  "version": "0.4.5",
+  "version": "0.5.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "docfast-api",
-      "version": "0.4.5",
+      "version": "0.5.1",
       "dependencies": {
         "compression": "^1.8.1",
         "express": "^4.21.0",