feat(extensions): Add Spring native WebClient transport implementation

[guanxuc]

AgentScope-Java Version

1.0.11

Description

• Closes: [Feature]: 支持使用 Spring WebClient 替代 OkHttp 作为可选 HTTP 传输实现 #872
• Add Spring native WebClient transport implementation.
• Add HttpTransport and WebSocketTransport auto-configuration bean

Checklist

Please check the following items before code is ready to be reviewed.

• 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

❌ Patch coverage is 84.26966% with 56 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...cope/spring/boot/transport/WebClientTransport.java	71.33%	35 Missing and 8 partials ⚠️
...cope/core/model/transport/HttpTransportConfig.java	40.00%	9 Missing ⚠️
...e/spring/boot/transport/TransportProviderType.java	91.30%	2 Missing ⚠️
...ntscope/core/model/transport/JdkHttpTransport.java	80.00%	1 Missing ⚠️
...n/java/io/agentscope/core/util/ExceptionUtils.java	90.90%	0 Missing and 1 partial ⚠️

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