feat: replace claude sdk

[Aias00]

AgentScope-Java Version

[The version of AgentScope-Java you are working on, e.g. 1.0.6, check your pom.xml dependency version or run mvn dependency:tree | grep agentscope-parent:pom(only mac/linux)]

Description

replace claude sdk
fix #97
[Please describe the background, purpose, changes made, and how to test this PR]

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

[Copilot]

Pull request overview

This PR replaces the Anthropic Java SDK with a custom HTTP client implementation using OkHttp. The change eliminates the external dependency on com.anthropic:anthropic-java and replaces it with internal DTO classes and a custom AnthropicClient.

Changes:

• Replaced Anthropic SDK with custom HTTP client (AnthropicClient.java)
• Introduced new DTO classes (AnthropicRequest, AnthropicResponse, AnthropicMessage, AnthropicContent, etc.)
• Updated all formatters and converters to work with DTOs instead of SDK types
• Updated comprehensive test suite to use new DTO-based approach

Reviewed changes

Copilot reviewed 24 out of 24 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
AnthropicClient.java	New HTTP client for Anthropic API with sync and streaming support
AnthropicChatModel.java	Updated to use new client instead of SDK
AnthropicRequest.java	DTO for API requests
AnthropicResponse.java	DTO for API responses
AnthropicMessage.java	DTO for message structure
AnthropicContent.java	DTO for content blocks with helper methods
AnthropicTool.java	DTO for tool definitions
AnthropicUsage.java	DTO for usage statistics
AnthropicStreamEvent.java	DTO for streaming events
AnthropicToolsHelper.java	Updated to work with DTOs
AnthropicResponseParser.java	Updated to parse DTOs
AnthropicMessageConverter.java	Updated to convert to DTOs
AnthropicMediaConverter.java	Updated to return DTO ImageSource
AnthropicChatFormatter.java	Enhanced with multi-agent detection
AnthropicMultiAgentFormatter.java	Updated for DTOs with constructor improvements
AnthropicBaseFormatter.java	Updated to work with DTOs
pom.xml	Removed Anthropic SDK dependency
Test files	Updated to use DTOs and mocks instead of SDK classes

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[codecov]

Codecov Report

❌ Patch coverage is 75.96439% with 162 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...java/io/agentscope/core/model/AnthropicClient.java	65.87%	31 Missing and 12 partials ⚠️
...re/formatter/anthropic/AnthropicChatFormatter.java	73.19%	16 Missing and 10 partials ⚠️
...formatter/anthropic/AnthropicMessageConverter.java	58.82%	17 Missing and 4 partials ⚠️
...e/formatter/anthropic/AnthropicResponseParser.java	88.09%	3 Missing and 7 partials ⚠️
...core/formatter/anthropic/dto/AnthropicMessage.java	52.38%	8 Missing and 2 partials ⚠️
...a/io/agentscope/core/model/AnthropicChatModel.java	60.86%	8 Missing and 1 partial ⚠️
.../formatter/anthropic/dto/AnthropicStreamEvent.java	77.14%	8 Missing ⚠️
...core/formatter/anthropic/AnthropicToolsHelper.java	82.50%	6 Missing and 1 partial ⚠️
...ore/formatter/anthropic/dto/AnthropicResponse.java	72.00%	7 Missing ⚠️
...pe/core/formatter/anthropic/dto/AnthropicTool.java	53.33%	7 Missing ⚠️
... and 4 more

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