⚡ Bolt: [performance improvement] Hoist loadConfig to prevent O(N) disk I/O in bulk worktree creation

[Donach]

💡 What:
Modified WorktreesService.create to call loadConfig() exactly once when processing an array of worktrees, instead of fetching it individually for every item inside a Promise.all loop. applyWorktreeCreateDefaults was updated to accept the config synchronously.

🎯 Why:
loadConfig() performs file reading and YAML parsing from the disk on every single invocation. When creating multiple worktrees in bulk, calling this method within a loop creates a severe O(N) disk I/O bottleneck, heavily blocking the Node.js event loop and slowing down execution significantly.

📊 Impact:
Reduces the disk I/O and latency of bulk worktree creation operations from O(N) to O(1). This completely eliminates the unnecessary synchronous/asynchronous file reads during iteration and improves overall system throughput.

🔬 Measurement:
Run pnpm test and pnpm lint and inspect apps/agor-daemon/src/services/worktrees.ts to ensure that loadConfig executes once outside the loop.

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PR created automatically by Jules for task 16661565703369552395 started by @Donach

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