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-144x144.svg

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="144" height="144" viewBox="0 0 144 144" xmlns="http://www.w3.org/2000/svg">
+  <rect width="144" height="144" rx="31" fill="#4A90E2"/>
+  
+  <!-- Cloud -->
+  <g transform="translate(72, 36)">
+    <!-- Cloud body -->
+    <ellipse cx="0" cy="0" rx="43" ry="21.5" fill="#FFFFFF"/>
+    <circle cx="-26" cy="-4" r="14" fill="#FFFFFF"/>
+    <circle cx="26" cy="-4" r="14" fill="#FFFFFF"/>
+    <circle cx="-13" cy="-11" r="10" fill="#FFFFFF"/>
+    <circle cx="13" cy="-11" r="10" fill="#FFFFFF"/>
+    
+    <!-- Cloud smile -->
+    <path d="M -13 4 Q 0 11 13 4" stroke="#4A90E2" stroke-width="3.5" fill="none" stroke-linecap="round"/>
+    
+    <!-- Cloud eyes -->
+    <circle cx="-7" cy="-1" r="3.5" fill="#4A90E2"/>
+    <circle cx="7" cy="-1" r="3.5" fill="#4A90E2"/>
+  </g>
+  
+  <!-- PC Monitor -->
+  <g transform="translate(72, 98)">
+    <!-- Monitor screen -->
+    <rect x="-36" y="-14" width="72" height="22" rx="2" fill="#2C3E50"/>
+    <rect x="-32" y="-11" width="64" height="16" rx="1" fill="#34495E"/>
+    
+    <!-- Screen content -->
+    <rect x="-28" y="-9" width="7" height="2" fill="#4A90E2"/>
+    <rect x="-28" y="-5.5" width="11" height="1" fill="#7FB3D3"/>
+    <rect x="-14" y="-9" width="5" height="5" fill="#5DADE2"/>
+    <rect x="-7" y="-9" width="7" height="2" fill="#4A90E2"/>
+    
+    <!-- Monitor stand -->
+    <rect x="-4" y="8" width="8" height="11" fill="#34495E"/>
+    <rect x="-18" y="19" width="36" height="4" rx="1" fill="#2C3E50"/>
+  </g>
+</svg>