Add LLM interface aggregation web extension

[kongweiguang]

Summary

Add a new agentscope-extensions-llm-interfaces-web module and Spring Boot starter that let one AgentScope ReActAgent expose stateless OpenAI Chat Completions, OpenAI Responses, and Anthropic Messages compatible endpoints under /v1.

The existing Chat Completions web extension remains intact. The new module reuses its Chat path and adds protocol adapters for Responses and Anthropic requests, responses, tools, usage, finish reasons, and SSE event streams. It also adds /v1/models, tolerant request parsing for common SDK extra fields, and clear unsupported-feature errors for stateful Responses fields.

Additional fixes

• Handle Spring Boot 4 request binding by accepting dynamic protocol JSON as Object and normalizing inside the adapter layer.
• Fix Windows/local full-test compatibility for sandbox find, file URL extension detection, multimodal RAG injection, and local image inputs.
• Register the new artifacts in extension/starter parents, BOM, all-in-one distribution, installation docs, and a runnable documentation example.

Validation

• mvn -pl agentscope-extensions/agentscope-extensions-llm-interfaces-web,agentscope-extensions/agentscope-spring-boot-starters/agentscope-llm-interfaces-web-starter -am test
• mvn spotless:check
• mvn test
• Packaged and ran agentscope-examples/documentation/llm-interfaces-web, then verified curl fixtures for /v1/models, /v1/chat/completions, /v1/responses, /v1/messages, Chat [DONE], Responses response.created / response.output_text.delta / response.completed, and Anthropic message_start / content_block_delta / message_delta / message_stop.

References

• OpenAI Responses API and streaming docs
• Anthropic Messages and streaming docs
• nanollm protocol aggregation ideas used only as reference, not as proxy/routing/admin implementation

[codecov]

Codecov Report

❌ Patch coverage is 65.62228% with 395 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...rfacesweb/responses/ResponsesMessageConverter.java	51.33%	40 Missing and 33 partials ⚠️
...oot/llm/interfacesweb/LlmInterfacesController.java	61.98%	34 Missing and 12 partials ⚠️
...rfacesweb/anthropic/AnthropicMessageConverter.java	71.57%	11 Missing and 16 partials ⚠️
...in/java/io/agentscope/core/rag/GenericRAGHook.java	0.00%	22 Missing ⚠️
...erfacesweb/responses/ResponsesResponseBuilder.java	68.18%	14 Missing and 7 partials ⚠️
...rfacesweb/responses/ResponsesStreamingAdapter.java	75.36%	9 Missing and 8 partials ⚠️
...oot/llm/interfacesweb/LlmInterfacesProperties.java	52.77%	17 Missing ⚠️
...rfacesweb/anthropic/AnthropicStreamingAdapter.java	81.81%	8 Missing and 8 partials ⚠️
.../llm/interfacesweb/responses/ResponsesRequest.java	56.75%	16 Missing ⚠️
...nterfacesweb/responses/ResponsesToolConverter.java	65.11%	5 Missing and 10 partials ⚠️
... and 16 more

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