Add test infrastructure and common module
- Testcontainers 2.0.4 (PostgreSQL) for repository integration tests - AbstractIntegrationTest base class with shared Postgres container - application-test.yml for test profile - Common module: ApiResponse/ApiError envelopes, GlobalExceptionHandler, ResourceNotFoundException, ConflictException, ValidationException, HouseholdContext record Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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