feat: add prefixed route

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

core/lib/Service/SecurityService.php

@@ -142,4 +142,19 @@ class SecurityService
     {
         return $this->tokenService->validateToken($token, $this->securityCode, checkBlacklist: false);
     }
+
+    /**
+     * Authenticate using a plain-text identity + password credential.
+     *
+     * Used by the DAV auth backend which receives credentials from the HTTP
+     * Basic challenge after they have been extracted from the Authorization header.
+     *
+     * @param string $identity  Username / e-mail
+     * @param string $password  Plain-text password
+     * @return User|null        Authenticated user, or null on failure
+     */
+    public function authenticatePassword(string $identity, string $password): ?User
+    {
+        return $this->authenticateBasic($identity, $password);
+    }
 }