refactor: remove global upload queue

Per-bot queues now handle concurrency internally.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

test/telegramQueue.test.ts

@@ -1,36 +0,0 @@
-import { describe, expect, it } from 'bun:test';
-import { enqueueUpload } from '../src/infrastructure/telegram/upload-queue';
-
-describe('Telegram Queue', () => {
-  it('should process tasks in parallel without limit', async () => {
-    let activeTasks = 0;
-    let maxActiveTasks = 0;
-
-    const createTask = (id: number, delayMs: number) => {
-      return async () => {
-        activeTasks++;
-        if (activeTasks > maxActiveTasks) {
-          maxActiveTasks = activeTasks;
-        }
-
-        await new Promise((resolve) => setTimeout(resolve, delayMs));
-
-        activeTasks--;
-        return id;
-      };
-    };
-
-    const promises = [
-      enqueueUpload(createTask(1, 50)),
-      enqueueUpload(createTask(2, 50)),
-      enqueueUpload(createTask(3, 50)),
-      enqueueUpload(createTask(4, 50)),
-    ];
-
-    const results = await Promise.all(promises);
-
-    expect(results).toEqual([1, 2, 3, 4]);
-    // Concurrency limit is removed, so active tasks should be able to reach 4 (fully parallel)
-    expect(maxActiveTasks).toBe(4);
-  });
-});