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### What problem does this PR solve? Closes #15388. Chat completion routes did not reliably honor per-request generation settings: - `/api/v1/chat/completions` copied generation settings with a truthiness check, so valid zero values such as `temperature: 0`, `top_p: 0`, `frequency_penalty: 0`, `presence_penalty: 0`, and `max_tokens: 0` were dropped. - `/api/v1/openai/{chat_id}/chat/completions` did not forward standard generation settings into the request-specific dialog LLM settings before calling `async_chat`. This PR preserves explicitly supplied generation parameters, including zero values, and merges request-level overrides into existing dialog settings where appropriate. The supported generation parameter keys and merge behavior live in a shared REST API helper to keep both completion routes aligned. Validation: - `git diff --check` - `python3 -m py_compile api/apps/restful_apis/_generation_params.py api/apps/restful_apis/chat_api.py api/apps/restful_apis/openai_api.py test/testcases/test_http_api/test_session_management/test_session_sdk_routes_unit.py` - `uv run ruff check api/apps/restful_apis/_generation_params.py api/apps/restful_apis/chat_api.py api/apps/restful_apis/openai_api.py test/testcases/test_http_api/test_session_management/test_session_sdk_routes_unit.py` - `ZHIPU_AI_API_KEY=dummy uv run pytest test/testcases/test_http_api/test_session_management/test_session_sdk_routes_unit.py -q -k generation_params` ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue)