test(01-03): add integration tests for health, OpenAPI, protocol version, forward compat, and TTL
- HealthControllerIT: health returns 200, no protocol header needed, TTL verified
- OpenApiIT: api-docs returns OpenAPI spec, swagger UI accessible
- ProtocolVersionIT: missing/wrong header returns 400, correct header passes, excluded paths work
- ForwardCompatIT: unknown JSON fields do not cause deserialization errors
- Fix testcontainers version to 2.0.3 (docker-java 3.7.0 for Docker Desktop 29.x compat)
- Fix ClickHouse schema: TTL with toDateTime() cast, non-nullable error columns for tokenbf_v1
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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