Implement WHMCS Addon Dashboard with API for stats and integrate billing provider logic

integrations/whmcs/modules/addons/hexagamecloud/sql/install.sql

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+CREATE TABLE IF NOT EXISTS `mod_hexagamecloud_installations` (
+  `id` int unsigned NOT NULL AUTO_INCREMENT,
+  `last_error` text NULL,
+  `updated_at` datetime NOT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+CREATE TABLE IF NOT EXISTS `mod_hexagamecloud_sync_cursors` (
+  `id` int unsigned NOT NULL AUTO_INCREMENT,
+  `events_cursor` varchar(64) NULL,
+  `last_poll_at` datetime NULL,
+  `updated_at` datetime NOT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+CREATE TABLE IF NOT EXISTS `mod_hexagamecloud_events` (
+  `id` int unsigned NOT NULL AUTO_INCREMENT,
+  `remote_event_id` varchar(64) NOT NULL,
+  `event_type` varchar(64) NOT NULL,
+  `payload` mediumtext NOT NULL,
+  `status` varchar(32) NOT NULL DEFAULT 'pending',
+  `processed_at` datetime NULL,
+  `created_at` datetime NOT NULL,
+  PRIMARY KEY (`id`),
+  UNIQUE KEY `remote_event_id` (`remote_event_id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+CREATE TABLE IF NOT EXISTS `mod_hexagamecloud_operations` (
+  `id` int unsigned NOT NULL AUTO_INCREMENT,
+  `operation` varchar(64) NOT NULL,
+  `status` varchar(32) NOT NULL,
+  `metadata` mediumtext NULL,
+  `created_at` datetime NOT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+CREATE TABLE IF NOT EXISTS `mod_hexagamecloud_reconciliation` (
+  `id` int unsigned NOT NULL AUTO_INCREMENT,
+  `run_id` varchar(64) NOT NULL,
+  `mode` varchar(32) NOT NULL,
+  `issue_count` int unsigned NOT NULL DEFAULT 0,
+  `payload` mediumtext NULL,
+  `created_at` datetime NOT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+INSERT IGNORE INTO `mod_hexagamecloud_installations` (`id`, `updated_at`) VALUES (1, UTC_TIMESTAMP());
+
+INSERT IGNORE INTO `mod_hexagamecloud_sync_cursors` (`id`, `updated_at`) VALUES (1, UTC_TIMESTAMP());