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

apple-icon-120x120.svg

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="120" height="120" viewBox="0 0 120 120" xmlns="http://www.w3.org/2000/svg">
+  <rect width="120" height="120" rx="26" fill="#4A90E2"/>
+  
+  <!-- Cloud -->
+  <g transform="translate(60, 30)">
+    <!-- Cloud body -->
+    <ellipse cx="0" cy="0" rx="36" ry="18" fill="#FFFFFF"/>
+    <circle cx="-22" cy="-3" r="12" fill="#FFFFFF"/>
+    <circle cx="22" cy="-3" r="12" fill="#FFFFFF"/>
+    <circle cx="-11" cy="-9" r="8.5" fill="#FFFFFF"/>
+    <circle cx="11" cy="-9" r="8.5" fill="#FFFFFF"/>
+    
+    <!-- Cloud smile -->
+    <path d="M -11 3 Q 0 9 11 3" stroke="#4A90E2" stroke-width="3" fill="none" stroke-linecap="round"/>
+    
+    <!-- Cloud eyes -->
+    <circle cx="-6" cy="-1" r="3" fill="#4A90E2"/>
+    <circle cx="6" cy="-1" r="3" fill="#4A90E2"/>
+  </g>
+  
+  <!-- PC Monitor -->
+  <g transform="translate(60, 82)">
+    <!-- Monitor screen -->
+    <rect x="-30" y="-12" width="60" height="18" rx="2" fill="#2C3E50"/>
+    <rect x="-27" y="-9" width="54" height="12" rx="1" fill="#34495E"/>
+    
+    <!-- Screen content -->
+    <rect x="-24" y="-7.5" width="6" height="1.5" fill="#4A90E2"/>
+    <rect x="-24" y="-4.5" width="9" height="0.75" fill="#7FB3D3"/>
+    <rect x="-12" y="-7.5" width="4.5" height="4.5" fill="#5DADE2"/>
+    <rect x="-6" y="-7.5" width="6" height="1.5" fill="#4A90E2"/>
+    
+    <!-- Monitor stand -->
+    <rect x="-3" y="6" width="6" height="9" fill="#34495E"/>
+    <rect x="-15" y="15" width="30" height="3" rx="1" fill="#2C3E50"/>
+  </g>
+</svg>