Use curl_with_retry and handle updater failure

Replace direct curl calls with curl_with_retry for fetching versions.json and downloading Tdarr_Updater.zip to improve network reliability. Add a post-update check that verifies /opt/tdarr/Tdarr_Server/Tdarr_Server exists; if missing, log an error suggesting possible DNS blocking and exit with code 250. Minor cleanup of updater artifacts remains unchanged.

ct/tdarr.sh

@@ -33,12 +33,16 @@ function update_script() {
   $STD apt upgrade -y
   rm -rf /opt/tdarr/Tdarr_Updater
   cd /opt/tdarr
-  RELEASE=$(curl -fsSL https://f000.backblazeb2.com/file/tdarrs/versions.json | grep -oP '(?<="Tdarr_Updater": ")[^"]+' | grep linux_x64 | head -n 1)
-  curl -fsSL "$RELEASE" -o Tdarr_Updater.zip
+  RELEASE=$(curl_with_retry "https://f000.backblazeb2.com/file/tdarrs/versions.json" "-" | grep -oP '(?<="Tdarr_Updater": ")[^"]+' | grep linux_x64 | head -n 1)
+  curl_with_retry "$RELEASE" "Tdarr_Updater.zip"
   $STD unzip Tdarr_Updater.zip
   chmod +x Tdarr_Updater
   $STD ./Tdarr_Updater
   rm -rf /opt/tdarr/Tdarr_Updater.zip
+  [[ -f /opt/tdarr/Tdarr_Server/Tdarr_Server ]] || {
+    msg_error "Tdarr_Updater failed — tdarr.io may be blocked by local DNS"
+    exit 250
+  }
   msg_ok "Updated Tdarr"
   msg_ok "Updated successfully!"
   exit

install/tdarr-install.sh

@@ -20,12 +20,16 @@ msg_ok "Installed Dependencies"
 msg_info "Installing Tdarr"
 mkdir -p /opt/tdarr
 cd /opt/tdarr
-RELEASE=$(curl -fsSL https://f000.backblazeb2.com/file/tdarrs/versions.json | grep -oP '(?<="Tdarr_Updater": ")[^"]+' | grep linux_x64 | head -n 1)
-curl -fsSL "$RELEASE" -o Tdarr_Updater.zip
+RELEASE=$(curl_with_retry "https://f000.backblazeb2.com/file/tdarrs/versions.json" "-" | grep -oP '(?<="Tdarr_Updater": ")[^"]+' | grep linux_x64 | head -n 1)
+curl_with_retry "$RELEASE" "Tdarr_Updater.zip"
 $STD unzip Tdarr_Updater.zip
 chmod +x Tdarr_Updater
 $STD ./Tdarr_Updater
 rm -rf /opt/tdarr/Tdarr_Updater.zip
+[[ -f /opt/tdarr/Tdarr_Server/Tdarr_Server ]] || {
+  msg_error "Tdarr_Updater failed — tdarr.io may be blocked by local DNS"
+  exit 250
+}
 msg_ok "Installed Tdarr"
 
 setup_hwaccel