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-48x48.svg

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="48" height="48" viewBox="0 0 48 48" xmlns="http://www.w3.org/2000/svg">
+  <!-- Cloud -->
+  <g transform="translate(24, 12)">
+    <!-- Cloud body -->
+    <ellipse cx="0" cy="0" rx="14" ry="7" fill="#4A90E2"/>
+    <circle cx="-8.5" cy="-1.5" r="5" fill="#4A90E2"/>
+    <circle cx="8.5" cy="-1.5" r="5" fill="#4A90E2"/>
+    <circle cx="-4" cy="-4.5" r="3.5" fill="#4A90E2"/>
+    <circle cx="4" cy="-4.5" r="3.5" fill="#4A90E2"/>
+    
+    <!-- Cloud smile -->
+    <path d="M -4 1.5 Q 0 4.5 4 1.5" stroke="#FFFFFF" stroke-width="1.2" fill="none" stroke-linecap="round"/>
+    
+    <!-- Cloud eyes -->
+    <circle cx="-2.5" cy="0" r="1.2" fill="#FFFFFF"/>
+    <circle cx="2.5" cy="0" r="1.2" fill="#FFFFFF"/>
+    <circle cx="-2.5" cy="0" r="0.6" fill="#333"/>
+    <circle cx="2.5" cy="0" r="0.6" fill="#333"/>
+  </g>
+  
+  <!-- PC Monitor -->
+  <g transform="translate(24, 33)">
+    <!-- Monitor screen -->
+    <rect x="-12" y="-6" width="24" height="9" rx="0.8" fill="#2C3E50" stroke="#4A90E2" stroke-width="1.2"/>
+    <rect x="-10.5" y="-4.5" width="21" height="6" rx="0.5" fill="#34495E"/>
+    
+    <!-- Screen content -->
+    <rect x="-9" y="-3.8" width="3" height="0.8" fill="#4A90E2"/>
+    <rect x="-9" y="-2.5" width="4.5" height="0.4" fill="#7FB3D3"/>
+    <rect x="-3.5" y="-3.8" width="2.2" height="2.2" fill="#5DADE2"/>
+    <rect x="-1" y="-3.8" width="3" height="0.8" fill="#4A90E2"/>
+    
+    <!-- Monitor stand -->
+    <rect x="-1.5" y="3" width="3" height="4.5" fill="#34495E"/>
+    <rect x="-6" y="7.5" width="12" height="1.5" rx="0.4" fill="#2C3E50"/>
+  </g>
+</svg>