fix issue #1184 problem 1

[xuhuafeifei]

AgentScope-Java Version

io.agentscope:agentscope-parent:pom:1.0.12-SNAPSHOT

Description

Relating to problem 1 in #1184: Need to uniformly configure HTTP proxy across all model implementations

Allow users to configure proxies via ProxyConfig on ChatModel classes such as Anthropic, DashScope, Gemini, Ollama, OpenAI, etc., consistent with the existing Builder pattern usage.

For models like DashScope that already support custom HttpTransport, clearly define the priority between httpTransport() and proxy() (custom transport takes precedence; proxy() may be ignored with a warning logged) to avoid confusion where "a proxy is set but doesn't take effect."

Checklist

Add a proxy(ProxyConfig) method (or equivalent constructor parameter) to each model's Builder, and apply proxyConfig.toJavaProxy() to the internal OkHttp / SDK client (as implemented in each file).

For DashScope: Extract a resolveTransport() method. When only proxy() is set, apply the proxy using a default OkHttpTransport with HttpTransportConfig. If both httpTransport() and proxy() are set, httpTransport() takes precedence and a warning is logged. Paths such as fetching the public key for encryption should use the same resolved HttpTransport.

Add or extend unit tests for the above models to cover proxy configuration and (for DashScope) transport resolution behavior.

• Code has been formatted with mvn spotless:apply
• All tests are passing (mvn test)
• Javadoc comments are complete and follow project conventions
• Related documentation has been updated (e.g. links, examples, etc.)
• Code is ready for review

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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