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

f_data/data_userfiles/.htaccess

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+<Files ~ "\.(php*|s?p?html|cgi|pl|py|asp|aspx|sh|cin)$">
+deny from all
+</Files>

f_data/data_userfiles/user_media/.htaccess

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+<Files ~ "\.(php*|s?p?html|cgi|pl|py|asp|aspx|sh|cin)$">
+deny from all
+</Files>

f_data/data_userfiles/user_profile/.htaccess

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+<Files ~ "\.(php*|s?p?html|cgi|pl|py|asp|aspx|sh|cin)$">
+deny from all
+</Files>

f_data/data_userfiles/user_uploads/.htaccess

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+<Files ~ "\.(php*|s?p?html|cgi|pl|py|asp|aspx|sh|cin)$">
+deny from all
+</Files>

f_data/data_userfiles/user_views/.htaccess

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+<Files ~ "\.(php*|s?p?html|cgi|pl|py|asp|aspx|sh|cin)$">
+deny from all
+</Files>