- Add test_server.go with chi-based router, shared in-memory SQLite DB, mock repositories
- Add mock_object_repository.go and mock_appeal_repository.go for lightweight testing
- Add setup.go with TestConfig/TestUser helpers, HTTP request builder, and fixtures
- Add go-sqlite3 dependency for in-memory test database
- Rewrite all 7 integration test suites (account, appeal, auth, comment, feedback, object, rating)
using the new test infrastructure