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/gg.svg

@@ -0,0 +1,16 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="512" width="512" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="-18 -12 36 24">
+  <defs>
+    <clipPath id="a">
+      <path fill-opacity=".67" d="M-18-18h36v36h-36z"/>
+    </clipPath>
+  </defs>
+  <path fill="#fff" d="M-18-18h36v36h-36z"/>
+  <g clip-path="url(#a)">
+    <path fill="#fff" d="M-18-12h36v24h-36z"/>
+    <path d="M0-18v36M-18 0h36" stroke="#e8112d" stroke-width="6" fill="none"/>
+    <path id="b" fill="#f9dd16" d="M-9 2l1-1h9v-2h-9l-1-1z"/>
+    <use xlink:href="#b" transform="rotate(90)" height="24" width="36"/>
+    <use xlink:href="#b" transform="rotate(-90)" height="24" width="36"/>
+    <use xlink:href="#b" transform="scale(-1)" height="24" width="36"/>
+  </g>
+</svg>