frontend: improve detail view badges, addon texts, and HTML title

[MickLesk]

✍️ Description

• Show colored type badges (VM/LXC/PVE/ADDON) in detail view matching list view
• Display PVE and ADDON labels in script cards instead of empty strings
• Show 'Existing LXC or Proxmox Node' as OS for addons instead of generic 'Proxmox Node'
• Hide privileged badge for addon scripts
• Add specific update hint for addons: 'Run update_ to update'
• Set document title to ' | Proxmox VE Helper-Scripts' when a script is selected

🔗 Related Issue

Fixes #12027

✅ Prerequisites (X in brackets)

• Self-review completed – Code follows project standards.
• Tested thoroughly – Changes work as expected.
• No security risks – No hardcoded secrets, unnecessary privilege escalations, or permission issues.

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🛠️ Type of Change (X in brackets)

• 🐞 Bug fix – Resolves an issue without breaking functionality.
• ✨ New feature – Adds new, non-breaking functionality.
• 💥 Breaking change – Alters existing functionality in a way that may require updates.
• 🆕 New script – A fully functional and tested script or script set.
• 🌍 Website update – Changes to website-related JSON files or metadata.
• 🔧 Refactoring / Code Cleanup – Improves readability or maintainability without changing functionality.
• 📝 Documentation update – Changes to README, AppName.md, CONTRIBUTING.md, or other docs.