feat: add Web Vault visibility switch

README.md

@@ -78,6 +78,8 @@
 
 - If the site reports a missing `JWT_SECRET`, add it as a **Secret** in Workers settings. In production use a random string of at least 32 characters; do not use temporary or example values.
 
+- To hide the Web Vault, add a text variable named `HIDE_WEB_VAULT` with the value `1` under **Workers settings → Variables and Secrets**. While enabled, server-hosted frontend pages and static assets return `404 Not Found`, while the login, sync, attachment, icon, notification, and other server endpoints used by Bitwarden clients remain available; an already installed or cached PWA can continue using its local frontend. Delete the variable (or change it to anything other than `1`) to restore the server-hosted Web Vault.
+
 - In this flow you hand code to Cloudflare to build and deploy. `wrangler.toml` or `wrangler.kv.toml` in the repo defines binding names; the Worker initializes the D1 schema on first request—no manual SQL upload.
 
 
@@ -147,4 +149,4 @@ LGPL-3.0 License
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