feat: 更新依赖注入核心能力，新增模块与功能，完善文档

[kooksee]

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求旨在全面提升 dix 依赖注入框架的健壮性和可维护性。通过优化核心 Provider 信息的处理方式，特别是对多输出类型 Provider 的支持，增强了依赖图的可视化能力。同时，引入了一套新的 GitHub Agent 指引和标准化的 Changelog 管理流程，以促进更高效的开发协作和版本发布。这些改进共同为 dix 项目的未来发展奠定了更坚实的基础。

Highlights

• 依赖注入核心能力增强: 重构了 dixhttp 模块中 Provider 信息的提取逻辑，现在能够聚合单个 Provider 函数产生的多个输出类型，并在依赖图可视化中正确展示和搜索这些多输出类型。
• 新增 GitHub Agent 指引与工具: 引入了多个 GitHub Agent 相关的 Markdown 文件，包括 dix 维护者代理定义、Copilot 指引、Changelog 维护规范、文档规范以及 PR 评审只读模式指引，旨在标准化开发流程和自动化任务。
• Changelog 管理系统: 新增了 .version/changelog 目录及其相关文件，建立了结构化的 Changelog 管理规范，包括 Unreleased.md 模板和版本发布落版机制。
• 测试覆盖与代码优化: 为 dixhttp 模块添加了新的测试用例，以验证 Provider 输出聚合功能的正确性。同时，对 Taskfile.yml 进行了版本语法更新，并对 dixinternal 中的类型声明进行了现代化改造（interface{} 替换为 any）。

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Code Review

This pull request significantly enhances the dixhttp dependency visualization by introducing provider aggregation, allowing a single provider function that produces multiple outputs to be accurately represented with all its output types in the dependency graph. This involves refactoring dixhttp/server.go to use new aggregateProviderInfos and providerAggregateKey functions, updating the ProviderInfo struct, and modifying dixhttp/template.html to display and interact with these multiple output types in the UI. A new test case TestHandleDependenciesAggregatesProviderOutputs was added to validate this aggregation. Additionally, the PR introduces several .github instruction and agent definition files to standardize project maintenance and AI agent interactions, updates the changelog structure, and includes minor fixes in Taskfile.yml and dixinternal/trace_chain_test.go. The review feedback suggests updating the future date in the v2.0.0.md changelog file to avoid confusion.