feat: add support for KV storage mode and enhance attachment handling

src/handlers/admin.ts

@@ -2,6 +2,7 @@ import { Env, User, Invite } from '../types';
 import { StorageService } from '../services/storage';
 import { jsonResponse, errorResponse } from '../utils/response';
 import { generateUUID } from '../utils/uuid';
+import { deleteBlobObject, getAttachmentObjectKey, getSendFileObjectKey } from '../services/blob-store';
 
 function isAdmin(user: User): boolean {
   return user.role === 'admin' && user.status === 'active';
@@ -260,7 +261,7 @@ export async function handleAdminDeleteUser(
   const attachmentMap = await storage.getAttachmentsByUserId(target.id);
   for (const [cipherId, attachments] of attachmentMap) {
     for (const att of attachments) {
-      await env.ATTACHMENTS.delete(`${cipherId}/${att.id}`);
+      await deleteBlobObject(env, getAttachmentObjectKey(cipherId, att.id));
     }
   }
   // 2. Send files (keyed by sends/sendId/fileId)
@@ -271,7 +272,7 @@ export async function handleAdminDeleteUser(
         const parsed = JSON.parse(send.data) as Record<string, unknown>;
         const fileId = typeof parsed.id === 'string' ? parsed.id : null;
         if (fileId) {
-          await env.ATTACHMENTS.delete(`sends/${send.id}/${fileId}`);
+          await deleteBlobObject(env, getSendFileObjectKey(send.id, fileId));
         }
       } catch { /* non-file send or bad data, skip */ }
     }