feat: add minSource property to Field interface for dynamic configuration binding

libs/api/src/lib/features/licensing/licensing.types.ts

@@ -109,6 +109,14 @@ export interface FormFieldConfig {
   showWhen?: FieldCondition;
   readOnly?: boolean;
   source?: string;
+  /**
+   * Marks `min` as bound to live configuration rather than stored with the
+   * field — `"licenseType.capitalThreshold"` for a capital amount. The server
+   * resolves it on every read, so `min` already carries the real floor by the
+   * time the wizard sees it; this is only here so the builder round-trips the
+   * binding instead of dropping it on save.
+   */
+  minSource?: string;
   sortOrder?: number;
 }