feat: enhance deployment process and update dependencies

- Updated the deployment script to build the web application before deploying.
- Upgraded Wrangler dependency from 4.61.1 to 4.69.0.

feat: add import item limit and request body size limit

- Introduced a new limit for the maximum total items allowed in a single import (5000).
- Set a hard body size limit for JSON API endpoints (25 MB).

feat: validate KDF parameters during registration and password change

- Added validation for KDF parameters to ensure compliance with Bitwarden's minimum requirements.
- Enhanced error handling for invalid KDF parameters during user registration and password change.

feat: clean up R2 files on user deletion

- Implemented cleanup of R2 files associated with user attachments and sends before deleting user metadata.

feat: verify folder ownership when creating or updating ciphers

- Added checks to ensure that users cannot reference folders owned by other users when creating or updating ciphers.

fix: handle corrupted cipher data gracefully

- Improved error handling when retrieving ciphers from the database to avoid crashes due to corrupted data.

feat: increment send access count atomically

- Added a method to atomically increment the access count for sends and return whether the update was successful.

fix: enforce request body size limits

- Implemented checks to reject oversized request bodies for non-file upload paths.

fix: update error handling for database initialization

- Enhanced error logging for database initialization failures while providing a generic message to clients.

feat: enhance security with Content Security Policy

- Added a Content Security Policy to the web application to improve security against XSS attacks.

fix: remove plaintext TOTP secret from localStorage

- Updated the TOTP enabling process to remove the plaintext secret from localStorage after it is stored on the server.

fix: ensure only PBKDF2 hash is sent for public send access

- Modified the public send access payload to ensure only the PBKDF2 hash is sent, never the plaintext password.

src/handlers/admin.ts

@@ -255,6 +255,28 @@ export async function handleAdminDeleteUser(
     return errorResponse('User not found', 404);
   }
 
+  // Clean up R2 files before DB cascade deletes the metadata rows.
+  // 1. Attachment files (keyed by cipherId/attachmentId)
+  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}`);
+    }
+  }
+  // 2. Send files (keyed by sends/sendId/fileId)
+  const sends = await storage.getAllSends(target.id);
+  for (const send of sends) {
+    if (send.type === 1) { // SendType.File
+      try {
+        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}`);
+        }
+      } catch { /* non-file send or bad data, skip */ }
+    }
+  }
+
   await storage.deleteRefreshTokensByUserId(target.id);
   await storage.deleteUserById(target.id);
   await writeAuditLog(storage, actorUser.id, 'admin.user.delete', 'user', target.id, {