fix: resolve CI test failures and timeouts

- Update Bun version in CI to match local version (1.2.16)
- Add bunfig.toml with 5s test timeout to prevent hanging tests
- Mock setTimeout globally in test setup to avoid timing issues
- Add NODE_ENV check to skip delays during tests
- Fix missing exports in config-encryption mock
- Remove retryDelay in tests to ensure immediate execution

These changes ensure tests run consistently between local and CI environments

bunfig.toml

@@ -0,0 +1,6 @@
+[test]
+# Set test timeout to 5 seconds (5000ms) to prevent hanging tests
+timeout = 5000
+
+# Preload the setup file
+preload = ["./src/tests/setup.bun.ts"]