feat: detect and persist Telegram Premium status after authentication

After TDLib login completes, calls getMe() to detect isPremium, persists
it to DB via updateAccountPremiumStatus, and returns { client, isPremium }
from createTdlibClient. All callers updated to destructure accordingly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

worker/src/extract-listener.ts

@@ -110,7 +110,7 @@ export async function processExtractRequest(requestId: string): Promise<void> {
       }
 
       const account = accounts[0];
-      const client = await createTdlibClient({ id: account.id, phone: account.phone });
+      const { client } = await createTdlibClient({ id: account.id, phone: account.phone });
 
       try {
         // Load chat list so TDLib can find the dest channel

worker/src/fetch-listener.ts

@@ -162,7 +162,7 @@ function handleGenerateInvite(channelId: string): void {
         }
 
         const account = accounts[0];
-        const client = await createTdlibClient({ id: account.id, phone: account.phone });
+        const { client } = await createTdlibClient({ id: account.id, phone: account.phone });
 
         try {
           const link = await generateInviteLink(client, destChannel.telegramId);
@@ -203,7 +203,7 @@ function handleCreateDestination(payload: string): void {
         }
 
         const account = accounts[0];
-        const client = await createTdlibClient({ id: account.id, phone: account.phone });
+        const { client } = await createTdlibClient({ id: account.id, phone: account.phone });
 
         try {
           // Create the supergroup via TDLib
@@ -337,7 +337,7 @@ function handleJoinChannel(payload: string): void {
           throw new Error("No authenticated accounts available");
         }
 
-        const client = await createTdlibClient({ id: account.id, phone: account.phone });
+        const { client } = await createTdlibClient({ id: account.id, phone: account.phone });
 
         try {
           const linkInfo = parseTelegramInput(parsed.input);

worker/src/manual-upload.ts

@@ -49,7 +49,7 @@ export async function processManualUpload(uploadId: string): Promise<void> {
     const account = accounts[0];
     if (!account) throw new Error("No authenticated Telegram account available");
 
-    const client = await createTdlibClient({ id: account.id, phone: account.phone });
+    const { client } = await createTdlibClient({ id: account.id, phone: account.phone });
 
     try {
       const packageIds: string[] = [];

worker/src/rebuild.ts

@@ -63,7 +63,7 @@ export async function rebuildPackageDatabase(
     }
 
     const account = accounts[0];
-    const client = await createTdlibClient({
+    const { client } = await createTdlibClient({
       id: account.id,
       phone: account.phone,
     });

worker/src/recovery.ts

@@ -63,7 +63,7 @@ export async function recoverIncompleteUploads(): Promise<void> {
   let client: Client | undefined;
 
   try {
-    client = await createTdlibClient({ id: account.id, phone: account.phone });
+    ({ client } = await createTdlibClient({ id: account.id, phone: account.phone }));
 
     // Load the chat list so TDLib can resolve chat IDs
     try {

worker/src/tdlib/client.ts

@@ -6,6 +6,7 @@ import { childLogger } from "../util/logger.js";
 import {
   updateAccountAuthState,
   getAccountAuthCode,
+  updateAccountPremiumStatus,
 } from "../db/queries.js";
 
 const log = childLogger("tdlib-client");
@@ -27,7 +28,7 @@ interface AccountConfig {
  */
 export async function createTdlibClient(
   account: AccountConfig
-): Promise<Client> {
+): Promise<{ client: Client; isPremium: boolean }> {
   const dbPath = path.join(config.tdlibStateDir, account.id);
 
   const client = createClient({
@@ -78,7 +79,30 @@ export async function createTdlibClient(
 
     await updateAccountAuthState(account.id, "AUTHENTICATED");
     log.info({ accountId: account.id }, "TDLib client authenticated");
-    return client;
+
+    let isPremium = false;
+    try {
+      const me = await client.invoke({ _: "getMe" }) as { is_premium?: boolean };
+      isPremium = me.is_premium ?? false;
+      await updateAccountPremiumStatus(account.id, isPremium);
+      log.info({ accountId: account.id, isPremium }, "Account Premium status detected");
+    } catch (err) {
+      log.warn({ err, accountId: account.id }, "Could not detect Premium status, defaulting to false");
+    }
+
+    client.on("update", (update: unknown) => {
+      const u = update as { _?: string; is_upload?: boolean };
+      if (u?._ === "updateSpeedLimitNotification") {
+        log.warn(
+          { accountId: account.id, isUpload: u.is_upload },
+          u.is_upload
+            ? "Upload speed limited by Telegram (account is not Premium)"
+            : "Download speed limited by Telegram (account is not Premium)"
+        );
+      }
+    });
+
+    return { client, isPremium };
   } catch (err) {
     log.error({ err, accountId: account.id }, "TDLib authentication failed");
     await updateAccountAuthState(account.id, "EXPIRED");

worker/src/worker.ts

@@ -73,10 +73,10 @@ export async function authenticateAccount(
 
   let client: Client | undefined;
   try {
-    client = await createTdlibClient({
+    client = (await createTdlibClient({
       id: account.id,
       phone: account.phone,
-    });
+    })).client;
     aLog.info("Authentication successful");
 
     // Auto-fetch channels and create a fetch request result
@@ -131,7 +131,7 @@ export async function processFetchRequest(requestId: string): Promise<void> {
   await updateFetchRequestStatus(requestId, "IN_PROGRESS");
   aLog.info({ accountId: request.accountId }, "Processing fetch request");
 
-  const client = await createTdlibClient({
+  const { client } = await createTdlibClient({
     id: request.account.id,
     phone: request.account.phone,
   });
@@ -336,10 +336,11 @@ export async function runWorkerForAccount(
       currentStep: "connecting",
     });
 
-    const client = await createTdlibClient({
+    const { client, isPremium } = await createTdlibClient({
       id: account.id,
       phone: account.phone,
     });
+    void isPremium; // will be used in Task 6 for upload limits
 
     // Load all chats into TDLib's local cache using loadChats (the recommended API).
     // Without this, getChat/searchChatMessages fail with "Chat not found".