Add Qwen, Zhipu, Volcengine, Baidu Qianfan, and Tencent Cloud LLM APIs

[Wu-kong-123]

Summary

This PR adds LLM API adapters for several common Chinese cloud platforms, so LLM4AD can use more providers beyond the original OpenAI-compatible HttpsApi.

Supported platforms added in this PR:

• Qwen: QwenAPI
• Zhipu AI: ZhipuAPI
• Volcengine Ark: VolcengineAPI
• Baidu Qianfan: BaiduQianfanAPI
• Tencent Cloud: TencentCloudAPI

Changes

• Added separate LLM API modules under llm4ad/tools/llm/:
  • llm_api_qwen.py
  • llm_api_zhipu.py
  • llm_api_volcengine.py
  • llm_api_baiduqianfan.py
  • llm_api_tencentcloud.py
• Kept the external interface consistent with the existing HttpsApi style: host`, `key`, `model`, `path`, `timeout.
• Each platform module uses its own default host and path, while keeping the request and response handling aligned with the existing OpenAI-compatible HTTPS flow.

Testing

• Verified syntax with py_compile for the new API modules.
• Tested selected providers through example/tasks/cvrp_construct/run_eoh.py.

Usage Example

from llm4ad.tools.llm.llm_api_qwen import QwenAPI

llm = QwenAPI(
    key='your-api-key',
    model='qwen3.7-max',
    timeout=120
)

[FeiLiu36]

Thank you for your contribution! Could you please create some example scripts for using different APIs in https://github.com/Optima-CityU/LLM4AD/tree/main/example/llms It will be very helpful.

[Wu-kong-123]

Thanks for the feedback!
I will add the example scripts for the newly supported APIs and update the PR accordingly.

[Wu-kong-123]

Added example/llms/test_apis.py to demonstrate how to use the newly added API adapters. I also tested each adapter with a simple draw_sample("hello") call.

Platform	API Class	Model Used	Result	Sample Output
Qwen	QwenAPI	qwen-plus	Passed	Hello! How can I help you today? 😊
Zhipu AI	ZhipuAPI	GLM-5.2	Passed	Hello! I'm GLM, trained by Z.ai. How can I assist you today?
Volcengine Ark	VolcengineAPI	doubao-seed-character-260628	Passed	Hello! How can I help you today?
Baidu Qianfan	BaiduQianfanAPI	ernie-5.1	Passed	Hello! 👋 How can I help you today?
Tencent Cloud	TencentCloudAPI	hy3-preview	Passed	Hello! 😊 How can I help you today?