Improve worker error logging and update Dokploy deployment docs

worker/main.ts

@@ -30,6 +30,17 @@ function check<T>(r: {
   if (r.error) throw new Error(r.error.message);
   return r.data!;
 }
+function summarizeWorkerError(error: unknown) {
+  const message = (error instanceof Error ? error.message : String(error))
+    .replace(/\s+/g, " ")
+    .trim();
+  if (/<(?:!doctype|html|head|body)\b/i.test(message)) {
+    const status = message.match(/\b([45]\d{2})\b/)?.[1];
+    const provider = /cloudflare/i.test(message) ? "Cloudflare" : "upstream";
+    return `${provider} returned an HTML error${status ? ` (${status})` : ""}`;
+  }
+  return message.length > 500 ? `${message.slice(0, 497)}…` : message;
+}
 async function processJob(job: {
   id: string;
   dataset_id: string;
@@ -427,7 +438,9 @@ while (!stopping) {
     if (jobs?.length) await processJob(jobs[0]);
     else await new Promise((r) => setTimeout(r, 2500));
   } catch (error) {
-    console.error("Worker:", error instanceof Error ? error.message : error);
+    console.error(
+      `Worker error (retrying in 5s): ${summarizeWorkerError(error)}`,
+    );
     await new Promise((r) => setTimeout(r, 5000));
   }
 }