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/4x3/tg.svg

@@ -0,0 +1,14 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="480" width="640" viewBox="0 0 640 480">
+  <defs>
+    <clipPath id="a">
+      <path fill-opacity=".67" d="M0 0h682.67v512H0z"/>
+    </clipPath>
+  </defs>
+  <g clip-path="url(#a)" fill-rule="evenodd" transform="scale(.9375)">
+    <path fill="#ffe300" d="M0 0h767.63v512H0z"/>
+    <path fill="#118600" d="M0 208.14h767.63v102.81H0zM0 .248h767.63v102.81H0z"/>
+    <path fill="#d80000" d="M0 .248h306.51v310.71H0z"/>
+    <path d="M134.42 128.43c0-.856 18.836-53.083 18.836-53.083l17.124 52.227s57.365 1.713 57.365.856-45.378 34.248-45.378 34.248 21.404 59.933 20.549 58.221c-.856-1.712-49.659-35.96-49.659-35.96s-49.658 34.248-48.802 34.248c.856 0 18.835-56.508 18.835-56.508l-44.522-33.392 55.652-.856z" fill="#fff"/>
+    <path fill="#118600" d="M0 409.19h767.63V512H0z"/>
+  </g>
+</svg>