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-152x152.svg

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="152" height="152" viewBox="0 0 152 152" xmlns="http://www.w3.org/2000/svg">
+  <rect width="152" height="152" rx="33" fill="#4A90E2"/>
+  
+  <!-- Cloud -->
+  <g transform="translate(76, 38)">
+    <!-- Cloud body -->
+    <ellipse cx="0" cy="0" rx="45" ry="22.5" fill="#FFFFFF"/>
+    <circle cx="-27" cy="-4" r="15" fill="#FFFFFF"/>
+    <circle cx="27" cy="-4" r="15" fill="#FFFFFF"/>
+    <circle cx="-13.5" cy="-11" r="10.5" fill="#FFFFFF"/>
+    <circle cx="13.5" cy="-11" r="10.5" fill="#FFFFFF"/>
+    
+    <!-- Cloud smile -->
+    <path d="M -13.5 4 Q 0 11 13.5 4" stroke="#4A90E2" stroke-width="3.5" fill="none" stroke-linecap="round"/>
+    
+    <!-- Cloud eyes -->
+    <circle cx="-7.5" cy="-1" r="3.5" fill="#4A90E2"/>
+    <circle cx="7.5" cy="-1" r="3.5" fill="#4A90E2"/>
+  </g>
+  
+  <!-- PC Monitor -->
+  <g transform="translate(76, 104)">
+    <!-- Monitor screen -->
+    <rect x="-38" y="-15" width="76" height="23" rx="2" fill="#2C3E50"/>
+    <rect x="-34" y="-12" width="68" height="17" rx="1" fill="#34495E"/>
+    
+    <!-- Screen content -->
+    <rect x="-30" y="-10" width="8" height="2" fill="#4A90E2"/>
+    <rect x="-30" y="-6" width="12" height="1" fill="#7FB3D3"/>
+    <rect x="-15" y="-10" width="6" height="6" fill="#5DADE2"/>
+    <rect x="-7" y="-10" width="8" height="2" fill="#4A90E2"/>
+    
+    <!-- Monitor stand -->
+    <rect x="-4" y="8" width="8" height="12" fill="#34495E"/>
+    <rect x="-19" y="20" width="38" height="4" rx="1" fill="#2C3E50"/>
+  </g>
+</svg>