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

src/index.ts

@@ -424,9 +424,11 @@ async function start() {
   process.on("SIGINT", () => shutdown("SIGINT"));
 }
 
-start().catch((err) => {
-  logger.error({ err }, "Failed to start");
-  process.exit(1);
-});
+if (process.env.NODE_ENV !== "test") {
+  start().catch((err) => {
+    logger.error({ err }, "Failed to start");
+    process.exit(1);
+  });
+}
 
 export { app };