feat: initial WooAApanel plugin

Full WooCommerce plugin for aaPanel hosting management:
- aaPanel API client (all website + database endpoints)
- Admin: server management, site/DB assignments, full site/DB management panels
- Customer My Account: web hosting tab with sites and databases
- WooDomains PowerDNS integration for DNS management
- WooCommerce order auto-provisioning (product → server linking)
- Permission model: admin has all actions, customers have scoped access

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

includes/class-wooaapanel-installer.php

@@ -0,0 +1,56 @@
+<?php
+defined( 'ABSPATH' ) || exit;
+
+class WooAApanel_Installer {
+
+    public static function install(): void {
+        global $wpdb;
+
+        $charset = $wpdb->get_charset_collate();
+
+        // aaPanel server instances.
+        $servers_sql = "CREATE TABLE {$wpdb->prefix}wooaapanel_servers (
+            id          INT NOT NULL AUTO_INCREMENT,
+            name        VARCHAR(100) NOT NULL,
+            url         VARCHAR(500) NOT NULL,
+            api_key     VARCHAR(500) NOT NULL,
+            active      TINYINT(1) NOT NULL DEFAULT 1,
+            created_at  DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+            PRIMARY KEY (id)
+        ) $charset;";
+
+        // Site (PHP project) assignments per customer.
+        $sites_sql = "CREATE TABLE {$wpdb->prefix}wooaapanel_site_assignments (
+            id          INT NOT NULL AUTO_INCREMENT,
+            customer_id BIGINT NOT NULL,
+            server_id   INT NOT NULL,
+            site_name   VARCHAR(255) NOT NULL,
+            domain      VARCHAR(255) NOT NULL,
+            created_at  DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+            PRIMARY KEY (id),
+            KEY idx_customer (customer_id),
+            KEY idx_server   (server_id),
+            UNIQUE KEY uniq_site (server_id, site_name)
+        ) $charset;";
+
+        // Database assignments per customer.
+        $dbs_sql = "CREATE TABLE {$wpdb->prefix}wooaapanel_db_assignments (
+            id          INT NOT NULL AUTO_INCREMENT,
+            customer_id BIGINT NOT NULL,
+            server_id   INT NOT NULL,
+            db_name     VARCHAR(255) NOT NULL,
+            created_at  DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+            PRIMARY KEY (id),
+            KEY idx_customer (customer_id),
+            KEY idx_server   (server_id),
+            UNIQUE KEY uniq_db (server_id, db_name)
+        ) $charset;";
+
+        require_once ABSPATH . 'wp-admin/includes/upgrade.php';
+        dbDelta( $servers_sql );
+        dbDelta( $sites_sql );
+        dbDelta( $dbs_sql );
+
+        update_option( 'wooaapanel_db_version', WOOAAPANEL_VERSION );
+    }
+}