Add logs to frontend - Complete UI implementation for log viewing

[Copilot]

This PR implements a complete frontend interface for viewing application logs, building on the JSON API endpoint that was added in PR #420.

Changes Made

Frontend Components

• Logs Button: Added a new info-colored button with journal icon to the navbar, positioned before the existing config and add buttons
• Logs Modal: Created a comprehensive modal dialog with:
  • Extra-large modal size for optimal log readability
  • Control panel with Refresh and Clear Display buttons
  • Auto-refresh toggle with 5-second intervals
  • Monospace font styling for proper log formatting
  • Scrollable container with auto-scroll to latest entries

JavaScript Functionality

• Integrated log fetching from the existing /api/logs endpoint
• Implemented log entry parsing and formatting with color-coded log levels:
  • INF (Info) entries displayed in green
  • ERR and FAT (Error/Fatal) entries displayed in red
• Added comprehensive error handling for API failures
• Implemented auto-refresh capability with user toggle control
• Added manual refresh and display clearing functionality

Technical Improvements

• Enhanced error handling in the main page handler with IP resolution fallback
• Updated .gitignore to properly exclude build artifacts and data files
• Maintained consistency with existing Bootstrap modal patterns and dark theme styling

Usage

Users can now click the logs button in the navbar to open a modal displaying real-time application logs. The interface provides controls for refreshing logs, clearing the display, and enabling auto-refresh for monitoring live log output.

The implementation seamlessly integrates with the existing UI design patterns and provides a user-friendly way to monitor application activity directly from the web interface.

Fixes #329.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• api.ipify.org
  • Triggering command: ./ddns-updater (dns block)
• api.ipy.ch
• api.my-ip.io
  • Triggering command: ./ddns-updater (dns block)
• icanhazip.com
• ident.me
  • Triggering command: ./ddns-updater (dns block)
• ifconfig.me
• nms.intellitrend.de
  • Triggering command: ./ddns-updater (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.