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

__install/add_upload_progress_system.sql

@@ -0,0 +1,47 @@
+-- ============================================================================
+-- EasyStream Upload Progress System Installation
+-- ============================================================================
+-- This SQL file adds upload progress tracking to EasyStream
+--
+-- Features:
+-- - Real-time upload progress tracking
+-- - Processing status updates
+-- - Multiple upload queue management
+-- - Error handling and reporting
+--
+-- Installation:
+-- docker exec -i easystream-db mysql -u easystream -peasystream easystream < __install/add_upload_progress_system.sql
+-- ============================================================================
+
+CREATE TABLE IF NOT EXISTS `db_upload_progress` (
+  `db_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
+  `upload_id` varchar(64) NOT NULL COMMENT 'Unique upload identifier',
+  `usr_id` int(10) unsigned NOT NULL COMMENT 'User ID',
+  `filename` varchar(255) NOT NULL COMMENT 'Original filename',
+  `file_type` varchar(20) NOT NULL COMMENT 'video, audio, image, document, etc.',
+  `file_size` bigint(20) unsigned NOT NULL DEFAULT 0 COMMENT 'Total file size in bytes',
+  `uploaded_bytes` bigint(20) unsigned NOT NULL DEFAULT 0 COMMENT 'Bytes uploaded so far',
+  `upload_percent` decimal(5,2) NOT NULL DEFAULT 0.00 COMMENT 'Upload percentage (0-100)',
+  `status` varchar(20) NOT NULL DEFAULT 'uploading' COMMENT 'uploading, processing, encoding, completed, failed, cancelled',
+  `processing_step` varchar(100) DEFAULT NULL COMMENT 'Current processing step description',
+  `error_message` text DEFAULT NULL COMMENT 'Error message if failed',
+  `file_key` varchar(32) DEFAULT NULL COMMENT 'File key after successful upload',
+  `started_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  `completed_at` datetime DEFAULT NULL,
+  PRIMARY KEY (`db_id`),
+  UNIQUE KEY `idx_upload_id` (`upload_id`),
+  KEY `idx_usr_status` (`usr_id`, `status`),
+  KEY `idx_started_at` (`started_at`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='Upload progress tracking';
+
+-- Cleanup old completed uploads (older than 7 days)
+CREATE EVENT IF NOT EXISTS cleanup_upload_progress
+ON SCHEDULE EVERY 1 DAY
+DO
+  DELETE FROM `db_upload_progress`
+  WHERE `status` IN ('completed', 'failed', 'cancelled')
+  AND `completed_at` < DATE_SUB(NOW(), INTERVAL 7 DAY);
+
+-- ============================================================================
+-- END OF INSTALLATION
+-- ============================================================================