feat(skills): add visa-doc-translate skill

Add automated visa document translation skill that:
- Supports multiple OCR methods (macOS Vision, EasyOCR, Tesseract)
- Translates documents to professional English
- Generates bilingual PDFs (original + translation)
- Handles various document types (bank statements, employment certificates, etc.)
- Perfect for visa applications to Australia, USA, Canada, UK, EU

Tested with retirement certificates and other official documents.

skills/visa-doc-translate/README.md

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+# Visa Document Translator
+
+Automatically translate visa application documents from images to professional English PDFs.
+
+## Features
+
+- 🔄 **Automatic OCR**: Tries multiple OCR methods (macOS Vision, EasyOCR, Tesseract)
+- 📄 **Bilingual PDF**: Original image + professional English translation
+- 🌍 **Multi-language**: Supports Chinese, and other languages
+- 📋 **Professional Format**: Suitable for official visa applications
+- 🚀 **Fully Automated**: No manual intervention required
+
+## Supported Documents
+
+- Bank deposit certificates (存款证明)
+- Employment certificates (在职证明)
+- Retirement certificates (退休证明)
+- Income certificates (收入证明)
+- Property certificates (房产证明)
+- Business licenses (营业执照)
+- ID cards and passports
+
+## Usage
+
+```bash
+/visa-doc-translate <image-file>
+```
+
+### Examples
+
+```bash
+/visa-doc-translate RetirementCertificate.PNG
+/visa-doc-translate BankStatement.HEIC
+/visa-doc-translate EmploymentLetter.jpg
+```
+
+## Output
+
+Creates `<filename>_Translated.pdf` with:
+- **Page 1**: Original document image (centered, A4 size)
+- **Page 2**: Professional English translation
+
+## Requirements
+
+### Python Libraries
+```bash
+pip install pillow reportlab
+```
+
+### OCR (one of the following)
+
+**macOS (recommended)**:
+```bash
+pip install pyobjc-framework-Vision pyobjc-framework-Quartz
+```
+
+**Cross-platform**:
+```bash
+pip install easyocr
+```
+
+**Tesseract**:
+```bash
+brew install tesseract tesseract-lang
+pip install pytesseract
+```
+
+## How It Works
+
+1. Converts HEIC to PNG if needed
+2. Checks and applies EXIF rotation
+3. Extracts text using available OCR method
+4. Translates to professional English
+5. Generates bilingual PDF
+
+## Perfect For
+
+- 🇦🇺 Australia visa applications
+- 🇺🇸 USA visa applications
+- 🇨🇦 Canada visa applications
+- 🇬🇧 UK visa applications
+- 🇪🇺 EU visa applications
+
+## License
+
+MIT