feat: 审查报告中英双语 + README Copilot 调侃

[lwpk110]

变更概述

国际化第一步：审查报告支持中英双语（默认英文），README 加入对 Copilot 套餐改契约的戏谑调侃。

变更内容

• REVIEW_LANGUAGE = en（默认）/ zh / bilingual：
  • 控制报告固定文案（变更概述/严重度/表格头/审查信息等标签表 LABELS）
  • buildSystemPrompt(language) 向 LLM 注入输出语言指令
  • 行内评论标签（Fix Suggestion 等）同步语言化
• 三形态同步：核心 / Actions 脚本 / Worker；测试 21 全过
• README：新增 REVIEW_LANGUAGE 配置说明；加入「为什么会有海姆达尔」段落——戏谑 Copilot 随意更改套餐契约、token 缩水、10 美元月中用尽，产生开发者共鸣

验证

• 构建 / 脚本 / Worker 通过；21 单测全过（含语言适配）
• README 围栏完整

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: cb3279a4-f59e-47a4-8b2e-de8655a2a69c

📥 Commits

Reviewing files that changed from the base of the PR and between 4ecbf15 and 847f10d.

📒 Files selected for processing (8)

• README.md
• scripts/heimdall-review.js
• src/config.ts
• src/review/index.ts
• src/review/parse.ts
• src/review/prompt.ts
• test/parse.test.js
• worker/index.ts

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