add: ability to require account to view profile

crates/core/src/model/auth.rs

@@ -210,6 +210,9 @@ pub struct UserSettings {
     /// The mime type of the user's banner.
     #[serde(default = "mime_avif")]
     pub banner_mime: String,
+    /// Require an account to view the user's profile.
+    #[serde(default)]
+    pub require_account: bool,
 }
 
 fn mime_avif() -> String {