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-180x180.svg

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="180" height="180" viewBox="0 0 180 180" xmlns="http://www.w3.org/2000/svg">
+  <rect width="180" height="180" rx="39" fill="#4A90E2"/>
+  
+  <!-- Cloud -->
+  <g transform="translate(90, 45)">
+    <!-- Cloud body -->
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+    <circle cx="-32" cy="-5" r="18" fill="#FFFFFF"/>
+    <circle cx="32" cy="-5" r="18" fill="#FFFFFF"/>
+    <circle cx="-16" cy="-13" r="12.5" fill="#FFFFFF"/>
+    <circle cx="16" cy="-13" r="12.5" fill="#FFFFFF"/>
+    
+    <!-- Cloud smile -->
+    <path d="M -16 5 Q 0 13 16 5" stroke="#4A90E2" stroke-width="4" fill="none" stroke-linecap="round"/>
+    
+    <!-- Cloud eyes -->
+    <circle cx="-9" cy="-2" r="4" fill="#4A90E2"/>
+    <circle cx="9" cy="-2" r="4" fill="#4A90E2"/>
+  </g>
+  
+  <!-- PC Monitor -->
+  <g transform="translate(90, 123)">
+    <!-- Monitor screen -->
+    <rect x="-45" y="-18" width="90" height="27" rx="3" fill="#2C3E50"/>
+    <rect x="-40" y="-14" width="80" height="19" rx="1.5" fill="#34495E"/>
+    
+    <!-- Screen content -->
+    <rect x="-35" y="-11.5" width="9" height="2.5" fill="#4A90E2"/>
+    <rect x="-35" y="-7" width="14" height="1.2" fill="#7FB3D3"/>
+    <rect x="-18" y="-11.5" width="7" height="7" fill="#5DADE2"/>
+    <rect x="-9" y="-11.5" width="9" height="2.5" fill="#4A90E2"/>
+    
+    <!-- Monitor stand -->
+    <rect x="-5" y="9" width="10" height="14" fill="#34495E"/>
+    <rect x="-22.5" y="23" width="45" height="5" rx="1.5" fill="#2C3E50"/>
+  </g>
+</svg>