Change client tag to 'Mew' instead of hostname

Use 'Mew' as the client name for encrypted metadata events instead of the deployment hostname, providing consistent client identification across all deployments.

Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>

src/hooks/useEncryptedSettings.ts

@@ -121,7 +121,7 @@ export function useEncryptedSettings() {
         tags: [
           ['d', SETTINGS_D_TAG],
           ['title', 'Mew Metadata'],
-          ['client', location.hostname],
+          ['client', 'Mew'],
         ],
         created_at: Math.floor(Date.now() / 1000),
       };