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/ss.svg

@@ -0,0 +1,11 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="480" width="640" viewBox="0 0 12.8 9.6">
+  <title>
+    Flag of South Sudan
+  </title>
+  <path fill="#078930" d="M0 6.72h12.8V9.6H0z"/>
+  <path fill="#fff" d="M0 2.88h12.8v3.84H0z"/>
+  <path d="M0 0h12.8v2.88H0z"/>
+  <path fill="#da121a" d="M0 3.36h12.8v2.88H0z"/>
+  <path fill="#0f47af" d="M0 0l8.314 4.8L0 9.6z"/>
+  <path fill="#fcdd09" d="M4.014 3.897L1.235 4.8l2.779.903-1.717-2.364v2.922z"/>
+</svg>