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

Caddyfile.livestream

@@ -0,0 +1,156 @@
+# Enhanced Caddyfile with Live Streaming Support
+# Caddy handles HTTP/HTTPS while SRS handles RTMP
+{
+    # Global options
+    admin off
+    auto_https on
+}
+
+# Main domain
+{$DOMAIN:localhost} {
+    # Root directory
+    root * /var/www/html
+    
+    # PHP handling
+    php_fastcgi php:9000
+    
+    # File server for static assets
+    file_server
+    
+    # Live streaming HLS proxy to SRS
+    handle /live/hls/* {
+        reverse_proxy srs:8080 {
+            header_up Host {upstream_hostport}
+            header_up X-Real-IP {remote_host}
+            header_up X-Forwarded-For {remote_host}
+            header_up X-Forwarded-Proto {scheme}
+        }
+    }
+    
+    # Live streaming HTTP-FLV proxy to SRS
+    handle /live/flv/* {
+        reverse_proxy srs:8080 {
+            header_up Host {upstream_hostport}
+            header_up X-Real-IP {remote_host}
+            header_up X-Forwarded-For {remote_host}
+            header_up X-Forwarded-Proto {scheme}
+        }
+    }
+    
+    # SRS API proxy
+    handle /api/srs/* {
+        reverse_proxy srs:1985 {
+            header_up Host {upstream_hostport}
+            header_up X-Real-IP {remote_host}
+            header_up X-Forwarded-For {remote_host}
+            header_up X-Forwarded-Proto {scheme}
+        }
+    }
+    
+    # WebSocket support for real-time features
+    @websockets {
+        header Connection *Upgrade*
+        header Upgrade websocket
+    }
+    handle @websockets {
+        reverse_proxy php:9000
+    }
+    
+    # Security headers
+    header {
+        # Security headers
+        Strict-Transport-Security "max-age=31536000; includeSubDomains; preload"
+        X-Content-Type-Options "nosniff"
+        X-Frame-Options "SAMEORIGIN"
+        X-XSS-Protection "1; mode=block"
+        Referrer-Policy "strict-origin-when-cross-origin"
+        
+        # CORS for streaming
+        Access-Control-Allow-Origin "*"
+        Access-Control-Allow-Methods "GET, POST, OPTIONS"
+        Access-Control-Allow-Headers "Content-Type, Authorization"
+    }
+    
+    # Gzip compression
+    encode gzip
+    
+    # Cache static assets
+    @static {
+        file
+        path *.css *.js *.png *.jpg *.jpeg *.gif *.ico *.svg *.woff *.woff2 *.ttf *.eot
+    }
+    handle @static {
+        header Cache-Control "public, max-age=31536000"
+        file_server
+    }
+    
+    # Cache video segments
+    @segments {
+        path *.ts *.m3u8
+    }
+    handle @segments {
+        header Cache-Control "public, max-age=10"
+        file_server
+    }
+    
+    # Handle API routes
+    handle /api/* {
+        php_fastcgi php:9000
+    }
+    
+    # Handle uploads
+    handle /upload* {
+        request_body {
+            max_size 2GB
+        }
+        php_fastcgi php:9000
+    }
+    
+    # Logging
+    log {
+        output file /var/log/caddy/access.log
+        format json
+    }
+    
+    # Error handling
+    handle_errors {
+        @404 {
+            expression {http.error.status_code} == 404
+        }
+        handle @404 {
+            rewrite * /404.php
+            php_fastcgi php:9000
+        }
+        
+        @500 {
+            expression {http.error.status_code} >= 500
+        }
+        handle @500 {
+            rewrite * /500.php
+            php_fastcgi php:9000
+        }
+    }
+}
+
+# Admin subdomain (optional)
+admin.{$DOMAIN:localhost} {
+    root * /var/www/html
+    php_fastcgi php:9000
+    
+    # Restrict to admin only
+    basicauth {
+        admin $2a$14$hNf2lJ8x.O3jQd8hdZWCOeB7oB8QrNn7fJ5F5F5F5F5F5F5F5F5F5
+    }
+    
+    # Admin-specific routes
+    handle /admin/* {
+        php_fastcgi php:9000
+    }
+}
+
+# Streaming subdomain (optional)
+stream.{$DOMAIN:localhost} {
+    # Redirect all streaming traffic to main domain
+    redir https://{$DOMAIN:localhost}/live{uri} permanent
+}
+}