fix: isParentActive return type to boolean

[terisikk]

Uses similar logic as isActive to force the original integer type to boolean to match the original intent.

Summary

In this pull request, the following changes are made:

• Monitor.isParentActive is fixed to use the same style as isActive, since the current implementation returns active: 0 for paused monitors, not active: true. The current behavior breaks the unofficial breml terraform provider.

To disclose LLM usage, claude code was used to debug the issue, the fix is my own and matches what a similar part in the codebase does.

Please follow this checklist to avoid unnecessary back and forth (click to expand)

• ⚠️ If there are Breaking change (a fix or feature that alters existing functionality in a way that could cause issues) I have called them out
• 🧠 I have disclosed any use of LLMs/AI in this contribution and reviewed all generated content.
  I understand that I am responsible for and able to explain every line of code I submit.
• 🔍 Any UI changes adhere to visual style of this project.
• 🛠️ I have self-reviewed and self-tested my code to ensure it works as expected.
• 📝 I have commented my code, especially in hard-to-understand areas (e.g., using JSDoc for methods).
• 🤖 I added or updated automated tests where appropriate.
• 📄 Documentation updates are included (if applicable).
• 🧰 Dependency updates are listed and explained.
• ⚠️ CI passes and is green.

[github-actions]

Hello and thanks for lending a paw to Uptime Kuma! 🐻👋
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If you have any design or process questions, feel free to ask them right here in this pull request - unclear documentation is a bug too.

[Copilot]

Pull request overview

Fixes Monitor.isParentActive to return a proper boolean (matching Monitor.isActive), avoiding 0 being returned for paused ancestors and improving downstream compatibility (e.g., consumers expecting strict booleans).

Changes:

• Update Monitor.isParentActive to use parent.active === 1 so the method always returns a boolean.

[CommanderStorm]

Fair

[github-actions]

@terisikk congrats on your first contribution to Uptime Kuma! 🐻
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