feat: fix multi-part archive forwarding and add kickstarter package linking

Multi-part send fix:
- Add destMessageIds BigInt[] to Package schema with backfill migration
- Worker uploadToChannel now returns all message IDs, stored in DB
- Bot forwards all parts of multi-part archives (not just the first)
- Add retry logic for upload rate limits (429) and download stalls

Kickstarter package linking:
- Add package search/linking queries and API routes
- Add PackageLinkerDialog with search + checkbox selection
- Add "Link Packages" and "Send All" actions to kickstarter table
- Add sendAllKickstarterPackages server action

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

worker/src/upload/channel.ts

@@ -3,12 +3,13 @@ import { stat } from "fs/promises";
 import type { Client } from "tdl";
 import { config } from "../util/config.js";
 import { childLogger } from "../util/logger.js";
-import { withFloodWait } from "../util/retry.js";
+import { withFloodWait, extractFloodWaitSeconds } from "../util/retry.js";
 
 const log = childLogger("upload");
 
 export interface UploadResult {
   messageId: bigint;
+  messageIds: bigint[];
 }
 
 /**
@@ -28,7 +29,7 @@ export async function uploadToChannel(
   filePaths: string[],
   caption?: string
 ): Promise<UploadResult> {
-  let firstMessageId: bigint | null = null;
+  const allMessageIds: bigint[] = [];
 
   for (let i = 0; i < filePaths.length; i++) {
     const filePath = filePaths[i];
@@ -49,11 +50,9 @@ export async function uploadToChannel(
       "Uploading file to channel"
     );
 
-    const serverMsgId = await sendAndWaitForUpload(client, chatId, filePath, fileCaption, fileName, fileSizeMB);
+    const serverMsgId = await sendWithRetry(client, chatId, filePath, fileCaption, fileName, fileSizeMB);
 
-    if (i === 0) {
-      firstMessageId = serverMsgId;
-    }
+    allMessageIds.push(serverMsgId);
 
     // Rate limit delay between uploads
     if (i < filePaths.length - 1) {
@@ -61,16 +60,68 @@ export async function uploadToChannel(
     }
   }
 
-  if (firstMessageId === null) {
+  if (allMessageIds.length === 0) {
     throw new Error("Upload failed: no messages sent");
   }
 
   log.info(
-    { chatId: Number(chatId), messageId: Number(firstMessageId), files: filePaths.length },
+    { chatId: Number(chatId), messageId: Number(allMessageIds[0]), files: filePaths.length },
     "All uploads confirmed by Telegram"
   );
 
-  return { messageId: firstMessageId };
+  return { messageId: allMessageIds[0], messageIds: allMessageIds };
+}
+
+/**
+ * Retry wrapper for sendAndWaitForUpload.
+ * Handles:
+ *  - Rate limits (429 / FLOOD_WAIT) from updateMessageSendFailed — waits and retries
+ *  - Stall / timeout — retries with a cooldown
+ */
+const MAX_UPLOAD_RETRIES = 3;
+
+async function sendWithRetry(
+  client: Client,
+  chatId: bigint,
+  filePath: string,
+  caption: string | undefined,
+  fileName: string,
+  fileSizeMB: number
+): Promise<bigint> {
+  for (let attempt = 0; attempt <= MAX_UPLOAD_RETRIES; attempt++) {
+    try {
+      return await sendAndWaitForUpload(client, chatId, filePath, caption, fileName, fileSizeMB);
+    } catch (err) {
+      const isLastAttempt = attempt >= MAX_UPLOAD_RETRIES;
+
+      // Rate limit from Telegram (429 / FLOOD_WAIT / "retry after N")
+      const waitSeconds = extractFloodWaitSeconds(err);
+      if (waitSeconds !== null && !isLastAttempt) {
+        const jitter = 1000 + Math.random() * 4000;
+        const waitMs = waitSeconds * 1000 + jitter;
+        log.warn(
+          { fileName, attempt: attempt + 1, maxRetries: MAX_UPLOAD_RETRIES, waitSeconds },
+          `Upload rate-limited — sleeping ${waitSeconds}s before retry`
+        );
+        await sleep(waitMs);
+        continue;
+      }
+
+      // Stall or timeout — retry with a cooldown
+      const errMsg = err instanceof Error ? err.message : "";
+      if ((errMsg.includes("stalled") || errMsg.includes("timed out")) && !isLastAttempt) {
+        log.warn(
+          { fileName, attempt: attempt + 1, maxRetries: MAX_UPLOAD_RETRIES },
+          "Upload stalled/timed out — retrying"
+        );
+        await sleep(10_000);
+        continue;
+      }
+
+      throw err;
+    }
+  }
+  throw new Error(`Upload failed after ${MAX_UPLOAD_RETRIES} retries for ${fileName}`);
 }
 
 /**
@@ -94,6 +145,7 @@ async function sendAndWaitForUpload(
     let lastLoggedPercent = 0;
     let tempMsgId: number | null = null;
     let uploadStarted = false;
+    let lastProgressBytes = 0;
     let lastProgressTime = Date.now();
 
     // Timeout: 20 minutes per GB, minimum 15 minutes
@@ -137,9 +189,14 @@ async function sendAndWaitForUpload(
         const file = update.file;
         if (file?.remote?.is_uploading_active && file.expected_size > 0) {
           uploadStarted = true;
-          lastProgressTime = Date.now();
 
           const uploaded = file.remote.uploaded_size ?? 0;
+
+          // Only reset stall timer when bytes actually advance
+          if (uploaded > lastProgressBytes) {
+            lastProgressBytes = uploaded;
+            lastProgressTime = Date.now();
+          }
           const total = file.expected_size;
           const percent = Math.round((uploaded / total) * 100);
           if (percent >= lastLoggedPercent + 20) {
@@ -178,7 +235,9 @@ async function sendAndWaitForUpload(
             settled = true;
             cleanup();
             const errorMsg = update.error?.message ?? "Unknown upload error";
-            reject(new Error(`Upload failed for ${fileName}: ${errorMsg}`));
+            const error = new Error(`Upload failed for ${fileName}: ${errorMsg}`);
+            (error as Error & { code?: number }).code = update.error?.code;
+            reject(error);
           }
         }
       }