fix #333: pass agent card query parameters correctly

[Sunrisea]

Summary

• preserve GetAgentCardParam.version and registration_type when querying an Agent Card
• use explicit keyword arguments when forwarding the request to the gRPC proxy
• add a focused regression test for the parameter mapping

Root cause

NacosAIService.get_agent_card() passed registration_type in the proxy's version position and version in the registration_type position. Queries that specified either field therefore generated an incorrect QueryAgentCardRequest.

Test plan

• python -m unittest test.test_nacos_ai_service test.test_skill_and_prompt test.test_client_config_builder test.test_naming_service_cache
• ruff check --select F --ignore F401 --exclude '*/grpcauto/*' v2/ test/test_nacos_ai_service.py
• python -m compileall -q v2/nacos/ai test/test_nacos_ai_service.py
• git diff --check

Closes #333