fix: Add default frontend config

crates/frontend/src/config.rs

@@ -12,3 +12,12 @@ pub struct FrontendConfig {
     #[serde(default = "default_true")]
     pub allow_password_login: bool,
 }
+
+impl Default for FrontendConfig {
+    fn default() -> Self {
+        Self {
+            enabled: true,
+            allow_password_login: true,
+        }
+    }
+}