⚡ Bolt: Optimize bulk worktree creation by hoisting loadConfig

[Donach]

💡 What: Hoisted loadConfig() out of applyWorktreeCreateDefaults when used in array mapping context.
🎯 Why: When WorktreesService.create is invoked with an array of items, it uses Promise.all to concurrently call applyWorktreeCreateDefaults for each item. Before this patch, applyWorktreeCreateDefaults was unconditionally awaiting loadConfig() per call, causing N simultaneous configuration file loads/parses leading to severe latency for bulk creates.
📊 Impact: Reduces disk I/O and parsing overhead from O(N) to O(1) during bulk creations.
🔬 Measurement: Benchmarking Promise.all calling loadConfig multiple times shows immediate speedup locally. Verified via the comprehensive daemon vitest suite.

---

PR created automatically by Jules for task 15108171954413516725 started by @Donach

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.