fix(zugferd): Refactor Zugferd decoders to properly extract house numbers from street names and remove unused imports; update readme hints with additional TInvoice reference and refresh PDF metadata timestamps.

ts/formats/cii/zugferd/zugferd.validator.ts

@@ -1,11 +1,24 @@
 import { CIIBaseValidator } from '../cii.validator.js';
-import { ValidationLevel } from '../../../interfaces/common.js';
-import type { ValidationResult } from '../../../interfaces/common.js';
 
 /**
  * Validator for ZUGFeRD invoice format
  */
 export class ZUGFeRDValidator extends CIIBaseValidator {
+  /**
+   * Validates ZUGFeRD XML structure
+   * @returns True if structure validation passed
+   */
+  protected validateStructure(): boolean {
+    // Check for required elements in ZUGFeRD structure
+    const invoiceId = this.getText('//rsm:ExchangedDocument/ram:ID');
+    if (!invoiceId) {
+      this.addError('ZUGFERD-STRUCT-1', 'Invoice ID is required', '//rsm:ExchangedDocument/ram:ID');
+      return false;
+    }
+
+    return true;
+  }
+
   /**
    * Validates ZUGFeRD XML against business rules
    * @returns True if business validation passed