fix: respond to webhooks immediately to prevent GitHub retries

[TooAngel]

Summary

• Fixed bug where activity log entries like "Pull request opened" appeared twice
• Root cause: GitHub was retrying webhooks due to 10-second timeout

Root Cause

The webhook handler was awaiting all processing before responding:

result = await handlePullRequestWebhook(data);  // API calls, DB ops...
res.json(result);  // Response sent AFTER processing

When processing took >10 seconds, GitHub would timeout and retry, causing duplicates.

Evidence from PR #318:

• 11:35:47 - Pull request opened
• 11:35:49 - Pull request opened (2 seconds later = GitHub retry)

Fix

Respond immediately, process asynchronously:

res.json({ info: 'Webhook received, processing asynchronously' });

(async () => {
  await handlePullRequestWebhook(data);
})();

Test plan

• All 109 unit tests pass
• Manual verification: open a PR and check activity log doesn't have duplicates

[worlddriven]

🤖 Worlddriven Status

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🗓️ Merge Date: 2025-12-03 at 23:19:41 UTC (today)
📅 Started: 2025-12-02 at 03:52:07 UTC
⚡ Speed Factor: 0.18 (82% faster due to reviews)
✅ Positive votes: 303/370 contribution weight (coefficient: 0.82)
📈 Base Merge Time: 10 days → Current: 2 days

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📋 Recent Activity

• 2025-11-30, 11:49:41 - Pull request opened
• 2025-11-30, 11:49:42 - Pull request opened
• 2025-12-03, 23:51:54 - Pull request merged by worlddriven ✅

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This comment is automatically updated by worlddriven