Added claudflare Turnstile captcha support

src/admin.rs

@@ -798,6 +798,8 @@ struct SettingsForm {
     timezone: String,
     site_domain: String,
     seo_keywords: String,
+    turnstile_site_key: String,
+    turnstile_secret_key: String,
 }
 
 async fn save_settings(request: Request, session: Session, db: Database) -> cot::Result<Response> {
@@ -814,6 +816,8 @@ async fn save_settings(request: Request, session: Session, db: Database) -> cot:
         ("timezone", form.timezone),
         ("site_domain", form.site_domain),
         ("seo_keywords", form.seo_keywords),
+        ("turnstile_site_key", form.turnstile_site_key),
+        ("turnstile_secret_key", form.turnstile_secret_key),
     ] {
         let k = key.to_string();
         let existing = query!(Setting, $key == k).get(&db).await?;