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

android-icon-96x96.svg

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="96" height="96" viewBox="0 0 96 96" xmlns="http://www.w3.org/2000/svg">
+  <!-- Cloud -->
+  <g transform="translate(48, 24)">
+    <!-- Cloud body -->
+    <ellipse cx="0" cy="0" rx="28" ry="14" fill="#4A90E2"/>
+    <circle cx="-17" cy="-3" r="10" fill="#4A90E2"/>
+    <circle cx="17" cy="-3" r="10" fill="#4A90E2"/>
+    <circle cx="-8.5" cy="-8.5" r="6.5" fill="#4A90E2"/>
+    <circle cx="8.5" cy="-8.5" r="6.5" fill="#4A90E2"/>
+    
+    <!-- Cloud smile -->
+    <path d="M -8.5 3 Q 0 9 8.5 3" stroke="#FFFFFF" stroke-width="2.5" fill="none" stroke-linecap="round"/>
+    
+    <!-- Cloud eyes -->
+    <circle cx="-5" cy="-1" r="2.5" fill="#FFFFFF"/>
+    <circle cx="5" cy="-1" r="2.5" fill="#FFFFFF"/>
+    <circle cx="-5" cy="-1" r="1.2" fill="#333"/>
+    <circle cx="5" cy="-1" r="1.2" fill="#333"/>
+  </g>
+  
+  <!-- PC Monitor -->
+  <g transform="translate(48, 66)">
+    <!-- Monitor screen -->
+    <rect x="-24" y="-12" width="48" height="18" rx="1.5" fill="#2C3E50" stroke="#4A90E2" stroke-width="2"/>
+    <rect x="-21" y="-9" width="42" height="12" rx="0.8" fill="#34495E"/>
+    
+    <!-- Screen content -->
+    <rect x="-18" y="-7.5" width="6" height="1.5" fill="#4A90E2"/>
+    <rect x="-18" y="-5" width="9" height="0.8" fill="#7FB3D3"/>
+    <rect x="-6" y="-7.5" width="4.5" height="4.5" fill="#5DADE2"/>
+    <rect x="-1" 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="-12" y="15" width="24" height="3" rx="0.8" fill="#2C3E50"/>
+  </g>
+</svg>