Add API logging functionality and enhance scheduler service

Introduced ApiLog model and integrated logging for scheduled tasks in the SchedulerService. Updated server.js to include request logging middleware and new API log routes. Enhanced frontend navigation by adding a link to system logs for admin users. Adjusted session check interval in App.vue for improved performance. This update improves monitoring and debugging capabilities across the application.

backend/migrations/create_api_log_table.sql

@@ -0,0 +1,26 @@
+-- Migration: Create api_log table for comprehensive request/response and execution logging
+
+CREATE TABLE IF NOT EXISTS api_log (
+  id INT AUTO_INCREMENT PRIMARY KEY,
+  user_id INT NULL,
+  method VARCHAR(10) NOT NULL COMMENT 'HTTP method (GET, POST, PUT, DELETE, etc.)',
+  path VARCHAR(500) NOT NULL COMMENT 'Request path',
+  status_code INT NULL COMMENT 'HTTP status code',
+  request_body TEXT NULL COMMENT 'Request body (truncated if too long)',
+  response_body TEXT NULL COMMENT 'Response body (truncated if too long)',
+  execution_time INT NULL COMMENT 'Execution time in milliseconds',
+  error_message TEXT NULL COMMENT 'Error message if request failed',
+  ip_address VARCHAR(45) NULL COMMENT 'Client IP address',
+  user_agent VARCHAR(500) NULL COMMENT 'User agent string',
+  log_type ENUM('api_request', 'scheduler', 'cron_job', 'manual') NOT NULL DEFAULT 'api_request' COMMENT 'Type of log entry',
+  scheduler_job_type VARCHAR(50) NULL COMMENT 'Type of scheduler job (rating_updates, match_results, etc.)',
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  FOREIGN KEY (user_id) REFERENCES user(id) ON DELETE SET NULL ON UPDATE CASCADE,
+  INDEX idx_api_log_user_id (user_id, created_at),
+  INDEX idx_api_log_path (path, created_at),
+  INDEX idx_api_log_log_type (log_type, created_at),
+  INDEX idx_api_log_created_at (created_at),
+  INDEX idx_api_log_status_code (status_code)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+