feat: Add comprehensive documentation suite and reorganize project structure

- Created complete documentation in docs/ directory
- Added PROJECT_OVERVIEW.md with feature highlights and getting started guide
- Added ARCHITECTURE.md with system design and technical details
- Added SECURITY.md with comprehensive security implementation guide
- Added DEVELOPMENT.md with development workflows and best practices
- Added DEPLOYMENT.md with production deployment instructions
- Added API.md with complete REST API documentation
- Added CONTRIBUTING.md with contribution guidelines
- Added CHANGELOG.md with version history and migration notes
- Reorganized all documentation files into docs/ directory for better organization
- Updated README.md with proper documentation links and quick navigation
- Enhanced project structure with professional documentation standards

f_scripts/shared/flagicon/flags/1x1/gy.svg

@@ -0,0 +1,9 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="512" width="512" viewBox="0 0 512 512">
+  <g fill-rule="evenodd">
+    <path fill="#399408" d="M1.946 0H512v512H1.946z"/>
+    <path d="M.14 0c-.673.078 495.688 257.58 495.688 257.58L-.002 511.75.14 0z" fill="#fff"/>
+    <path d="M.23 21.532c2.768 0 447.253 232.41 444.722 234.7L1.494 494.152.23 21.532z" fill="#ffde08"/>
+    <path d="M1.495.836c1.478 0 232.762 256.98 232.762 256.98L1.495 508.776V.826z"/>
+    <path d="M.23 36.162c1.325-15.985 208.733 222.29 208.733 222.29L.23 481.812V36.162z" fill="#de2110"/>
+  </g>
+</svg>