docs(readme): 优化样式并添加多语言版本

[yororoA]

概要

• 重构 README 首屏，增加品牌图标、状态徽章、快捷导航和迁移流程图
• 使用 GitHub 原生提示块强化兼容性与隐私边界
• 新增英语、日语、德语、俄语和繁体中文 README，并提供统一语言切换入口
• 重整文档索引，提升长文档的可扫描性
• 更新 npm 包校验，确保所有本地化 README 随包发布

验证

• npm run check（480 项测试通过，lint、类型检查、构建与 smoke test 通过）
• npm run verify:package
• npx --yes markdownlint-cli2 'README*.md'
• 校验全部 README 的本地链接与语言互链

Summary by Sourcery

Redesign the README documentation and add multilingual versions to make migration guidance clearer and more accessible.

New Features:

• Add English, Japanese, German, Russian, and Traditional Chinese README translations with consistent language navigation.
• Add a redesigned README landing section with branding, status badges, quick links, migration flow diagrams, and structured compatibility guidance.

Enhancements:

• Improve README organization and scanability with clearer migration steps, GitHub alert blocks, compatibility explanations, privacy boundaries, and documentation indexes.
• Include localized README files in package artifact verification and required-file checks.

Documentation:

• Expand the project’s user-facing README documentation across six languages while keeping links and navigation consistent.

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[sourcery-ai]

Reviewer's Guide

本 PR 以统一的首屏结构重写 README，使用图标、徽章、导航、流程图和 GitHub 提示块提升可读性，并新增英语、日语、德语、俄语及繁体中文版本；所有版本同步展示迁移流程、兼容性、安全边界和文档索引，同时已通过测试、类型检查、Markdown 校验及本地链接互链验证。

Flow diagram for the documented TRAE to OpenCode migration

flowchart LR
    A["TRAE session<br>Read-only extraction"] --> B["Export and redact<br>Migration Bundle"]
    B --> C["Map OpenCode v1 / v2 protocol"]
    C --> D["Native import"]
    D --> E["Read back and reconcile<br>content and hashes"]

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File-Level Changes

Change	Details	Files
重构中文 README 首屏并重新组织长文档导航，突出迁移流程、兼容性和隐私安全边界。	加入品牌图标、CI/版本/运行环境/许可证徽章及快捷导航 将迁移步骤和数据流改为表格、Mermaid 流程图与 GitHub 原生提示块 将文档链接重整为按主题分类的索引表	README.md
新增五种语言的完整 README，并通过一致的语言切换入口相互关联。	新增英语、日语、德语、俄语和繁体中文版本 在各语言版本中同步迁移命令、兼容性要求、限制、隐私说明和故障排查内容 为每个版本提供本地文档链接、快捷导航和统一语言选择器	README.en.md README.ja.md README.de.md README.ru.md README.zh-Hant.md

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