Add default avatar in discord notifications

[cyril59310]

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📋 Overview

Provide a clear summary of the purpose and scope of this pull request:

• What problem does this pull request address?

  • The solution is to check whether an avatar image is defined in the Discord webhook payload.

    If no avatar is defined by the user, we will set the default Uptime Kuma image as the avatar.

    If the user has defined a custom avatar in the webhook settings, we will respect their choice and keep their custom image.

🔄 Changes

🛠️ Type of change

• 🐛 Bugfix (a non-breaking change that resolves an issue)
• ✨ New feature (a non-breaking change that adds new functionality)
• ⚠️ Breaking change (a fix or feature that alters existing functionality in a way that could cause issues)
• 🎨 User Interface (UI) updates
• 📄 New Documentation (addition of new documentation)
• 📄 Documentation Update (modification of existing documentation)
• 📄 Documentation Update Required (the change requires updates to related documentation)
• 🔧 Other (please specify):
  • Provide additional details here.

🔗 Related Issues

• Relates to Add avatar_url to discord messages #5883
• Resolves Add avatar_url to discord messages #5883

📄 Checklist *

• 🔍 My code adheres to the style guidelines of this project.
• ✅ I ran ESLint and other code linters for modified files.
• 🛠️ I have reviewed and tested my code.
• 📝 I have commented my code, especially in hard-to-understand areas (e.g., using JSDoc for methods).
• ⚠️ My changes generate no new warnings.
• 🤖 My code needed automated testing. I have added them (this is an optional task).
• 📄 Documentation updates are included (if applicable).
• 🔒 I have considered potential security impacts and mitigated risks.
• 🧰 Dependency updates are listed and explained.
• 📚 I have read and understood the Pull Request guidelines.

📷 Screenshots or Visual Changes

Avatar not set

avatar set

ℹ️ Additional Context

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• Design decisions – Key choices or trade-offs made during development.
• Alternative solutions – Approaches considered but not implemented, along with reasons.
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• Dependencies – Related pull requests or issues that must be resolved before merging.
• Additional context – Any other details that may help reviewers understand the changes.

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💬 Requested Feedback

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[CommanderStorm]

Looks great, thanks