feat: Add Lingo.Dev AI localization setup

.github/workflows/localization.yml

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+name: Lingo.Dev AI Localization
+
+on:
+  push:
+    branches: [ main, master ]
+    paths:
+      - 'packages/ui/src/i18n/locales/**'
+      - 'packages/extension/public/_locales/**'
+      - '**.md'
+      - 'docs/**'
+  pull_request:
+    branches: [ main, master ]
+    paths:
+      - 'packages/ui/src/i18n/locales/**'
+      - 'packages/extension/public/_locales/**'
+      - '**.md'
+      - 'docs/**'
+  workflow_dispatch: # Allow manual triggering
+
+jobs:
+  lingo-localization:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # Fetch full history for better localization context
+
+      - name: Lingo.Dev AI Localization
+        uses: lingodotdev/lingo.dev@0.99.4
+        with:
+          # Required: Lingo.dev API key (set in repository secrets)
+          api-key: ${{ secrets.LINGODOTDEV_API_KEY }}
+
+          # Optional: Version of Lingo.dev CLI to use
+          version: "latest"
+
+          # Optional: Create pull request for translation updates
+          pull-request: true
+
+          # Optional: Custom commit message
+          commit-message: "🌐 Update translations via Lingo.Dev AI"
+
+          # Optional: Custom pull request title
+          pull-request-title: "🌐 Automated AI Translation Updates"
+
+          # Optional: Working directory (useful for monorepos)
+          working-directory: "."
+
+          # Optional: Process own commits (avoid infinite loops)
+          process-own-commits: false
+
+          # Optional: Enable parallel processing for faster execution
+          parallel: true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

LOCALIZATION_SETUP.md

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+# Lingo.Dev AI Localization Setup Summary
+
+## ✅ Files Created/Modified
+
+### 1. GitHub Workflow
+- **Created**: `.github/workflows/localization.yml`
+- **Purpose**: Automated AI-powered localization workflow
+- **Triggers**: Push/PR to main/master, manual dispatch
+
+### 2. Configuration File  
+- **Created**: `lingo.config.json`
+- **Purpose**: Lingo.Dev configuration for translation behavior
+- **Features**: Source language (zh-CN), target languages, file patterns
+
+### 3. Documentation
+- **Created**: `docs/localization.md`
+- **Purpose**: Comprehensive guide for the localization setup
+- **Contents**: Configuration, workflow, best practices
+
+## 🚀 What's Now Enabled
+
+1. **Automatic Translation**: AI translates your English content to Chinese and other languages
+2. **Smart Context**: Understanding of your Vue.js i18n structure and Chrome extension locales  
+3. **Pull Request Workflow**: Creates PRs for review before merging translations
+4. **Multiple Formats**: Handles TypeScript, JSON, and Markdown files
+5. **Manual Control**: Can trigger localization manually via GitHub Actions
+
+## 🎯 Target Languages Configured
+
+- �� Chinese (zh-CN) - Auto-generated
+- 🇯🇵 Japanese (ja-JP)
+- 🇰🇷 Korean (ko-KR)  
+- 🇪🇸 Spanish (es-ES)
+- 🇫🇷 French (fr-FR)
+- 🇩🇪 German (de-DE)
+
+## 📂 Files Being Localized
+
+- `packages/ui/src/i18n/locales/**/*.ts` - Vue.js i18n files
+- `packages/extension/public/_locales/**/*.json` - Chrome extension
+- `README*.md` & `docs/**/*.md` - Documentation
+
+## 🔄 Next Steps
+
+1. **Commit & Push**: These files to trigger the first localization run
+2. **Review PRs**: Check AI-generated translations for accuracy
+3. **Merge**: Approved translations to enable multi-language support
+4. **Test**: Verify translations work in your application
+
+The setup is complete and ready to use! 🎉