feat: add openadapt doctor command and fix audit/wormhole bugs

[abrichr]

Summary

• Add openadapt doctor command — checks all dependencies, configuration, and connectivity in one place
• Fix audit log directory not created before write (crashes if parent dir missing)
• Fix wormhole backend using Popen without awaiting — now uses subprocess.run() with timeout

Example output

$ openadapt doctor
OpenAdapt Doctor
============================================================
  [OK] Engine version: v0.1.1
  [OK] Python: 3.12.7
  [OK] Data directory: /Users/user/.openadapt
  [OK] Database (SQLite): connected
  [OK] openadapt-capture: 0.1.0
  [OK] openadapt-privacy: 0.1.0
  [OK] psutil: 7.2.2
  [!!] boto3 (S3 backend): not installed (pip install openadapt-desktop[enterprise])
  [!!] huggingface_hub (HF backend): not installed (pip install openadapt-desktop[community])
  [OK] magic-wormhole (P2P backend): /usr/local/bin/wormhole
  [OK] Storage mode: air-gapped
============================================================
9/11 checks passed

Run 'pip install openadapt-desktop[full]' to install all optional dependencies.

Test plan

• 109 tests pass (3 new doctor tests + 106 existing)
• Lint clean (ruff)
• Smoke tested openadapt doctor locally
• Cross-platform CI (awaiting)

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