Add core data structures for Buildings and Rooms (v0.1.0)

Phase 1 implementation includes:
- Custom Post Type: Buildings with address, contact, and details meta
- Custom Post Type: Rooms with building relationship and gallery
- Custom Taxonomy: Room Types (hierarchical)
- Custom Taxonomy: Amenities (non-hierarchical with icons)
- Admin columns, filters, and status badges
- Gallery meta box with media library integration

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

wp-bnb.php

@@ -3,7 +3,7 @@
  * Plugin Name: WP BnB Management
  * Plugin URI: https://src.bundespruefstelle.ch/magdev/wp-bnb
  * Description: A comprehensive Bed & Breakfast management system for WordPress. Manage buildings, rooms, bookings, and guests.
- * Version: 0.0.1
+ * Version: 0.1.0
  * Requires at least: 6.0
  * Requires PHP: 8.3
  * Author: Marco Graetsch
@@ -24,7 +24,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 }
 
 // Plugin version constant - MUST match Version in header above.
-define( 'WP_BNB_VERSION', '0.0.1' );
+define( 'WP_BNB_VERSION', '0.1.0' );
 
 // Plugin path constants.
 define( 'WP_BNB_PATH', plugin_dir_path( __FILE__ ) );
@@ -155,6 +155,18 @@ function wp_bnb_activate(): void {
 		);
 	}
 
+	// Load Composer autoloader for activation.
+	$autoloader = WP_BNB_PATH . 'vendor/autoload.php';
+	if ( file_exists( $autoloader ) ) {
+		require_once $autoloader;
+
+		// Register post types and taxonomies before flushing rewrite rules.
+		\Magdev\WpBnb\Taxonomies\Amenity::register();
+		\Magdev\WpBnb\Taxonomies\RoomType::register();
+		\Magdev\WpBnb\PostTypes\Building::register();
+		\Magdev\WpBnb\PostTypes\Room::register();
+	}
+
 	// Set default options.
 	add_option( 'wp_bnb_version', WP_BNB_VERSION );