feat: replace cloud translation with local Neural CLI

## Changes

### Removed (OpenAI-dependent)
- ❌ `.github/workflows/translation-sync.yml` - GPT-Translate workflow
- ❌ `docs/Development/translation-workflow.md` - OpenAI setup docs

### Added (Local Ollama-based)
- ✅ `Makefile`: New `make translate` target using Neural CLI
- ✅ `docs/Development/translation-guide.md` - Neural CLI guide

## Benefits

**Before (GPT-Translate)**:
- 💰 Monthly cost: ~¥90 (OpenAI API)
- 🔑 Requires API key setup
- 🌐 Data sent to external API
- ⏱️ Network latency

**After (Neural CLI)**:
- ✅ **$0 cost** - Fully local execution
- ✅ **No API keys** - Zero setup friction
- ✅ **Privacy** - No external data transfer
- ✅ **Fast** - ~1-2 min per README
- ✅ **Offline capable** - Works without internet

## Technical Details

**Neural CLI**:
- Built in Rust with Tauri
- Uses Ollama + qwen2.5:3b model
- Binary size: 4.0MB
- Auto-installs to ~/.local/bin/

**Usage**:
```bash
make translate  # Translates README.md → README-zh.md, README-ja.md
```

## Requirements

- Ollama installed: `curl -fsSL https://ollama.com/install.sh | sh`
- Model downloaded: `ollama pull qwen2.5:3b`
- Neural CLI built: `cd ~/github/neural/src-tauri && cargo build --bin neural-cli --release`

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/translation-sync.yml

@@ -1,96 +0,0 @@
-name: Auto-translate README
-
-on:
-  push:
-    branches: [master, main]
-    paths:
-      - 'README.md'
-  pull_request:
-    paths:
-      - 'README.md'
-  workflow_dispatch:
-
-permissions:
-  contents: write
-  pull-requests: write
-
-jobs:
-  translate:
-    name: Translate README to Multiple Languages
-    runs-on: ubuntu-latest
-
-    steps:
-    - name: Checkout repository
-      uses: actions/checkout@v4
-      with:
-        fetch-depth: 0
-
-    - name: Translate README to Chinese
-      uses: 3ru/gpt-translate@v1.1.11
-      with:
-        apikey: ${{ secrets.OPENAI_API_KEY }}
-        inputFiles: 'README.md'
-        outputFiles: 'README-zh.md'
-        targetLanguage: 'Simplified Chinese'
-
-    - name: Translate README to Japanese
-      uses: 3ru/gpt-translate@v1.1.11
-      with:
-        apikey: ${{ secrets.OPENAI_API_KEY }}
-        inputFiles: 'README.md'
-        outputFiles: 'README-ja.md'
-        targetLanguage: 'Japanese'
-
-    - name: Check for changes
-      id: check_changes
-      run: |
-        if git diff --quiet HEAD -- README-zh.md README-ja.md; then
-          echo "No translation changes detected"
-          echo "has_changes=false" >> $GITHUB_OUTPUT
-        else
-          echo "Translation changes detected"
-          echo "has_changes=true" >> $GITHUB_OUTPUT
-        fi
-
-    - name: Commit translations
-      if: steps.check_changes.outputs.has_changes == 'true'
-      run: |
-        git config --local user.email "github-actions[bot]@users.noreply.github.com"
-        git config --local user.name "github-actions[bot]"
-        git add README-zh.md README-ja.md
-        git commit -m "chore: auto-translate README to ZH/JA
-
-        🤖 Generated with [GPT-Translate](https://github.com/3ru/gpt-translate)
-
-        Co-Authored-By: GitHub Actions <noreply@github.com>"
-
-    - name: Push changes
-      if: steps.check_changes.outputs.has_changes == 'true' && github.event_name == 'push'
-      uses: ad-m/github-push-action@master
-      with:
-        github_token: ${{ secrets.GITHUB_TOKEN }}
-        branch: ${{ github.ref }}
-
-    - name: Create Pull Request
-      if: steps.check_changes.outputs.has_changes == 'true' && github.event_name == 'pull_request'
-      uses: peter-evans/create-pull-request@v6
-      with:
-        token: ${{ secrets.GITHUB_TOKEN }}
-        commit-message: "chore: auto-translate README to ZH/JA"
-        title: "🌐 Auto-translate README updates"
-        body: |
-          ## 🤖 Automated Translation Update
-
-          This PR contains automated translations of README.md updates.
-
-          **Changes:**
-          - ✅ README-zh.md (Simplified Chinese)
-          - ✅ README-ja.md (Japanese)
-
-          **Translation powered by:**
-          - [GPT-Translate](https://github.com/3ru/gpt-translate)
-          - OpenAI GPT-4
-
-          Please review the translations for accuracy before merging.
-        branch: chore/auto-translate-readme
-        delete-branch: true