feat: add Deskew PDF and Font to Outline tools with improved issue templates

New Features:
- Add Deskew PDF tool for straightening scanned/skewed PDF pages
- Add Font to Outline tool for converting text to vector paths
- Add translations for new tools in all supported locales (de, en, id, it, tr, vi, zh)

Improvements:
- Migrate GitHub issue templates from markdown to YAML forms
  - Separate templates for bug reports, feature requests, and questions
  - Add config.yml for issue template chooser
- Update sitemap.xml with new tool pages
- Update ghostscript loader and helper utilities

public/locales/zh/tools.json

@@ -518,5 +518,13 @@
     "subtitle": "将电子邮件文件 (EML, MSG) 转换为 PDF 格式。支持 Outlook 导出和标准邮件格式。",
     "acceptedFormats": "EML, MSG 文件",
     "convertButton": "转换为 PDF"
+  },
+  "fontToOutline": {
+    "name": "字体转轮廓",
+    "subtitle": "将所有字体转换为矢量轮廓，确保在所有设备上一致呈现。"
+  },
+  "deskewPdf": {
+    "name": "校正 PDF",
+    "subtitle": "使用 OpenCV 自动校正倾斜的扫描页面。"
   }
 }