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

favicon-16x16.svg

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
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+    <circle cx="1.5" cy="-1.5" r="1.2" fill="#4A90E2"/>
+    
+    <!-- Cloud smile -->
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+    
+    <!-- Cloud eyes -->
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+    <circle cx="-1" cy="0" r="0.2" fill="#333"/>
+    <circle cx="1" cy="0" r="0.2" fill="#333"/>
+  </g>
+  
+  <!-- PC Monitor -->
+  <g transform="translate(8, 11)">
+    <!-- Monitor screen -->
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+    <rect x="-3.5" y="-1.5" width="7" height="2" rx="0.2" fill="#34495E"/>
+    
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+    <rect x="0" y="-1.2" width="1" height="0.3" fill="#4A90E2"/>
+    
+    <!-- Monitor stand -->
+    <rect x="-0.5" y="1" width="1" height="1.5" fill="#34495E"/>
+    <rect x="-2" y="2.5" width="4" height="0.5" rx="0.2" fill="#2C3E50"/>
+  </g>
+</svg>