Add windowsHide flag to child process spawns on Windows

[Copilot]

Multiple visible console windows appear on Windows 11 when using claude-mem, caused by child processes spawned without the windowsHide flag.

Changes

Two spawnSync calls missing the windowsHide: true option:

• src/utils/bun-path.ts: Bun availability check

  spawnSync('bun', ['--version'], {
    encoding: 'utf-8',
    stdio: ['pipe', 'pipe', 'pipe'],
    shell: isWindows,
    windowsHide: true  // Added
  });

• src/shared/worker-utils.ts: PM2 cleanup during migration

  spawnSync('pm2', ['delete', 'claude-mem-worker'], { 
    stdio: 'ignore',
    windowsHide: true  // Added
  });

Both locations now consistent with existing spawn calls elsewhere in the codebase that already use this flag.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Multiple visible console windows popping up (Windows 11, claude code in terminal)</issue_title>
<issue_description>Describe the bug
Multiple visible console windows open during a claude code session. Ref: #208 - still seeing this having installed today.

To Reproduce
Steps to reproduce the behavior:

1. Install claude-mem
2. Instruct claude
3. Multiple visible terminal windows open as I type a question to claude code with "claude" as a title

Expected behavior
No visible console windows

Desktop (please complete the following information):

• OS: Windows 11
• Browser None (claude code in terminal)

Additional context
Installed on Windows using installation guide. Otherwise functional, but would like to find a resolution to the constant popup terminal windows if possible
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Multiple visible console windows popping up (Windows 11, claude code in terminal) #304

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