fix: Nagios Provider #3960

[Ayush9026]

/claim #3960
Closes #3960

📑 Description

Nagios Provider Implementation

This PR adds support for Nagios monitoring system integration with Keep. The implementation allows users to:

• Fetch alerts from Nagios (both host and service status)
• Acknowledge host and service problems
• Enable/disable host and service checks
• Map Nagios severity levels to Keep's alert severity system

Features

• Full integration with Nagios Core's CGI API
• Support for both host and service monitoring
• Proper authentication handling
• Comprehensive error handling
• Follows Keep's provider implementation patterns

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

ℹ Additional Information

[vercel]

@Ayush9026 is attempting to deploy a commit to the KeepHQ Team on Vercel.

A member of the Team first needs to authorize it.

[shahargl]

1. why did you delete IncidentActivityComment?
2. Missing lot of files - docs, icon, etc. did you even try to run it?

[Ayush9026]

@shahargl sir

Fixing now – thanks for catching that!

[talboren]

@Ayush9026 are you on fixing the open items here?

we need:

1. Icon
2. documentation
3. fixing non-relevant removed files

[talboren]

Closing for now as this is stale.