feat(jslib): add vault options functions

tools/upend_js/api.ts

@@ -259,4 +259,34 @@ export class UpEndApi {
     await this.wasmExtensions.init();
     return this.wasmExtensions.components_to_addr(components);
   }
+
+  public async getVaultOptions(): Promise<VaultOptions> {
+    const response = await fetch(`${this.apiUrl}/options`);
+    return await response.json();
+  }
+
+  public async setVaultOptions(options: VaultOptions): Promise<void> {
+    const payload: Record<string, unknown> = {};
+
+    if (options.blob_mode) {
+      const blob_mode: Record<string, unknown> = {};
+      blob_mode[options.blob_mode] = null;
+      payload["blob_mode"] = blob_mode;
+    }
+
+    const response = await fetch(`${this.apiUrl}/options`, {
+      method: "PUT",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify(payload),
+    });
+
+    if (!response.ok) {
+      throw Error(await response.text());
+    }
+  }
+}
+
+export type VaultBlobMode = "Flat" | "Mirror" | "Incoming";
+export interface VaultOptions {
+  blob_mode: VaultBlobMode;
 }