Update proxy to Zhanlu v1.4.2 provider flow
The 1.4.2 extension replaced the old signed/encrypted chat gateway with an
OpenAI-compatible aigateway. Align the proxy with the new flow:
- Use ecloud.10086.cn login/model base URLs, zhanlu_ide plugin headers and
v1.4.2 plugin version
- Provision the model API key via SM2-signed get-or-create after v1/login
profile fetch; store api_key/model_base_url/email in credentials
- Chat via Bearer apiKey against {modelBaseUrl}/chat/completions with plain
OpenAI SSE passthrough; fetch /v1/models from the gateway model-info endpoint
- Force HTTP/1.1 upstream (gateway drops HTTP/2 ALPN negotiation with EOF)
- Drop obsolete AES body encryption, model name mapping and vscode headers
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