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/be/css/tip.min.css

@@ -0,0 +1 @@
+.google-visualization-tooltip{background:#111 !important;border:none !important}.google-visualization-tooltip span{color:#fff !important}span[rel='tooltip']{cursor:pointer;display:inline-block}.tooltip{text-align:center;color:#fff;background:#111;position:absolute;z-index:9999;padding:5px;line-height:initial;font-size:12px;border-radius:5px;-moz-border-radius:5px;margin-top:4px}.tooltip:after{width:0;height:0;border-left:5px solid transparent;border-right:5px solid transparent;border-top:5px solid #111;content:'';position:absolute;left:50%;bottom:-5px;margin-left:-5px}.tooltip.top:after{border-top-color:transparent;border-bottom:5px solid #111;top:-10px;bottom:auto}.tooltip.left:after{left:5px;margin:0}.tooltip.right:after{right:5px;left:auto;margin:0}