docs: 统一开发者插件定位与双语文档

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文档混用了中英文正文，并将当前本地代码已实现的开发功能描述为缺失，也存在面向普通业务软件的配置迁移范围误解。本次依据本地源码统一开发者 IDE 插件定位，建立两端功能核对矩阵，并将普通文档维护为独立的中英文文件。

• 将 AGENT.md 合并到 AGENTS.md，明确需要承担的开发调试职责及不需要承担的业务参数迁移、删除参数恢复等职责。Agent、技能和配套说明使用中文单文件。
• 补齐普通文档英文版本，同步两端功能状态、设计说明、配置入口、历史结论和相互链接。
• 记录真实行为差异和验证边界，不把参数已保存或已发送描述为业务运行已应用。
• 调整 VSIX 排除规则，排除新增英文发布指南；其余脚本修改仅修正文档名称注释。
• 更新 JetBrains 子模块至对应文档提交 a3fe7a2。未改动运行逻辑或项目实际配置。

验证：主仓 4 个 Node 检查和 2 个执行器 Python 检查通过；JetBrains 4 组测试共 45 个用例通过；7 个面板设计系统检查通过；文档检查通过（16 组双语文档、7 份 Agent/技能说明），链接和对应章节完整；git diff --check 通过。VSIX 打包成功，已检查压缩包不含 Agent、技能、开发文档和测试资源。未进行实际 IDE 界面和游戏运行验收。

依赖与合并顺序：此 PR 以主仓 #22 的 codex/box-source-preview 分支为基线，仅展示后续文档改动。先合并现有 JetBrains #17 和主仓 #22，再将后续文档 PR 基线调整到 main。随后先合并 JetBrains 文档 PR #18，再处理本 PR；若子仓采用 squash，合并本 PR 前须将 gitlink 更新为子仓 main 上实际的合并提交。

工作区另有 PR review 技能及等待脚本改动，本次未纳入两个 PR。

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