feat(telegram): add "skip & disable topic" on the live worker panel

Track the forum topic currently being processed on IngestionRun
(currentTopicId + currentAccountChannelMapId; additive migration) and
expose it on the live status. processArchiveSets gains an optional
shouldStop callback polled before each archive set; the forum branch
passes a live isTopicFetchEnabled check, so disabling a topic mid-run
lets the in-flight file finish, then skips the rest of that topic.

A new disableActiveTopic server action sets the topic's fetchEnabled
false (upsert), and the worker status panel shows a "Skip & disable
this topic" button while a topic is being processed. Future runs skip
the topic via the existing live per-topic read.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/lib/telegram/queries.ts

@@ -550,6 +550,8 @@ export async function getIngestionStatus(): Promise<IngestionAccountStatus[]> {
             totalBytes: currentRun.totalBytes?.toString() ?? null,
             downloadPercent: currentRun.downloadPercent,
             lastActivityAt: currentRun.lastActivityAt?.toISOString() ?? null,
+            currentTopicId: currentRun.currentTopicId?.toString() ?? null,
+            currentAccountChannelMapId: currentRun.currentAccountChannelMapId,
           }
         : null,
     });

src/lib/telegram/types.ts

@@ -123,5 +123,7 @@ export interface IngestionAccountStatus {
     totalBytes: string | null; // BigInt serialized as string
     downloadPercent: number | null;
     lastActivityAt: string | null;
+    currentTopicId: string | null; // BigInt serialized as string
+    currentAccountChannelMapId: string | null;
   } | null;
 }