feat(gh-bugcop): implement caching and improve issue processing

- Add KeyV SQLite caching for GitHub API calls to reduce API usage
- Refactor issue fetching to query labels separately for better API efficiency
- Add comprehensive logging for better debugging and monitoring
- Improve timeline processing with cached API calls
- Remove dry-run mode to enable actual label management
- Update status display with new label constants for better UI feedback

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: snomiao

app/tasks/gh-bugcop/gh-bugcop.tsx

@@ -196,7 +196,6 @@ async function processIssue(issue: GH["issue"]) {
       .filter((e) => e.label?.name === labelName)
       .sort(compareBy((e) => e.created_at))
       .reverse()[0];
-
   const latestLabeledEvent = lastLabeled(BUGCOP_ASKING_FOR_INFO) || lastLabeled(BUGCOP_ANSWERED);
   if (!latestLabeledEvent) {
     lastLabeled(BUGCOP_RESPONSE_RECEIVED) ||