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/lc.svg

@@ -0,0 +1,8 @@
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+  <g fill-rule="evenodd">
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+    <path d="M255.02 102.95l150.05 362.66-297.58.83 147.53-363.49z"/>
+    <path d="M254.83 256.1l173.51 210.83-344.11.48 170.6-211.31z" fill="#ffce00"/>
+  </g>
+</svg>