feat(vault): add get/create assets API in workflow

TODO: update vault.service.ts. Use MNEMONIC workflow to create real private_key_shard and content_inner_encrypted

src/utils/vaultAssets.ts

@@ -0,0 +1,100 @@
+/**
+ * Vault assets: API ↔ UI mapping and initial mock data.
+ * Used by useVaultAssets and VaultScreen for /assets/get and /assets/create flows.
+ */
+
+import type { VaultAsset, VaultAssetType } from '../types';
+
+// -----------------------------------------------------------------------------
+// Types
+// -----------------------------------------------------------------------------
+
+/** Shape returned by GET /assets/get (backend AssetOut) */
+export interface ApiAsset {
+  id: number;
+  title: string;
+  type?: string;
+  created_at?: string;
+  updated_at?: string;
+}
+
+// -----------------------------------------------------------------------------
+// Constants
+// -----------------------------------------------------------------------------
+
+export const VAULT_ASSET_TYPES: VaultAssetType[] = [
+  'game_account',
+  'private_key',
+  'document',
+  'photo',
+  'will',
+  'custom',
+];
+
+// -----------------------------------------------------------------------------
+// Mapping
+// -----------------------------------------------------------------------------
+
+/**
+ * Map backend API asset to VaultAsset for UI.
+ */
+export function mapApiAssetToVaultAsset(api: ApiAsset): VaultAsset {
+  const type: VaultAssetType =
+    api.type && VAULT_ASSET_TYPES.includes(api.type as VaultAssetType)
+      ? (api.type as VaultAssetType)
+      : 'custom';
+  return {
+    id: String(api.id),
+    type,
+    label: api.title,
+    createdAt: api.created_at ? new Date(api.created_at) : new Date(),
+    updatedAt: api.updated_at ? new Date(api.updated_at) : new Date(),
+    isEncrypted: true,
+  };
+}
+
+/**
+ * Map array of API assets to VaultAsset[].
+ */
+export function mapApiAssetsToVaultAssets(apiList: ApiAsset[]): VaultAsset[] {
+  return apiList.map(mapApiAssetToVaultAsset);
+}
+
+// -----------------------------------------------------------------------------
+// Mock / initial data (fallback when API is unavailable)
+// -----------------------------------------------------------------------------
+
+export const initialVaultAssets: VaultAsset[] = [
+  {
+    id: '1',
+    type: 'private_key',
+    label: 'ETH Main Wallet Key',
+    createdAt: new Date('2024-01-10'),
+    updatedAt: new Date('2024-01-10'),
+    isEncrypted: true,
+  },
+  {
+    id: '2',
+    type: 'game_account',
+    label: 'Steam Account Credentials',
+    createdAt: new Date('2024-01-08'),
+    updatedAt: new Date('2024-01-08'),
+    isEncrypted: true,
+  },
+  {
+    id: '3',
+    type: 'document',
+    label: 'Insurance Policy Scan',
+    createdAt: new Date('2024-01-05'),
+    updatedAt: new Date('2024-01-05'),
+    isEncrypted: true,
+  },
+  {
+    id: '4',
+    type: 'will',
+    label: 'Testament Draft v2',
+    createdAt: new Date('2024-01-02'),
+    updatedAt: new Date('2024-01-15'),
+    isEncrypted: true,
+  },
+];