Add Kunde CRUD with addresses/contacts, delivery edit, and Auftrag sub-nav.

Wire customergroup/entity APIs, Lieferungen detail editing, and Angebot/Bestellung/Ausliefern/Retoure placeholders.

src/api/StorageManager.js

@@ -293,6 +293,10 @@ export class StorageManager extends ApiClient {
     const posterminalCache = createCache('GET /posterminal', () => this.#loadPosterminals());
     const supplierCache = createCache('GET /supplier', () => this.#loadSuppliers());
     const deliveryCache = createCache('GET /delivery', () => this.#loadDeliveries());
+    const customergroupCache = createCache('GET /customergroup', () =>
+      this.#loadCustomergroups(),
+    );
+    const entityCache = createCache('GET /entity', () => this.#loadEntities());
 
     Object.defineProperties(this, {
       authMePromise: { get: () => authMeCache.promise },
@@ -336,6 +340,16 @@ export class StorageManager extends ApiClient {
       /** Settled GET /delivery list, or undefined. */
       deliveries: { get: () => deliveryCache.value },
 
+      customergroupPromise: { get: () => customergroupCache.promise },
+      updateCustomergroup: { value: customergroupCache.update },
+      /** Settled GET /customergroup list, or undefined. */
+      customergroups: { get: () => customergroupCache.value },
+
+      entityPromise: { get: () => entityCache.promise },
+      updateEntity: { value: entityCache.update },
+      /** Settled GET /entity list, or undefined. */
+      entities: { get: () => entityCache.value },
+
       /** Close and reopen GET /api/events (required after selected-company change). */
       reconnectEvents: { value: () => this.#reconnectEvents() },
     });
@@ -468,6 +482,18 @@ export class StorageManager extends ApiClient {
     return requireArray(data.deliveries, 'deliveries');
   }
 
+  async #loadCustomergroups() {
+    const data = await this.customergroup.list();
+    requireObject(data, 'GET /api/customergroup');
+    return requireArray(data.customergroups, 'customergroups');
+  }
+
+  async #loadEntities() {
+    const data = await this.entity.list();
+    requireObject(data, 'GET /api/entity');
+    return requireArray(data.entities, 'entities');
+  }
+
   async doSearch({ target, filter, offset, maxCount, onUpdate }) {
     const articles = await this.articleIndexPromise;
     const query = target.trim().toLowerCase();