Pr/librems id multi fixes

[marcinpsk]

Summary

Briefly describe what this PR does in plain English, and provide as much of the following information as possible.

Motivation / Problem

What issue does this solve?

• Bug
• Feature
• Refactor
• Maintenance / cleanup

Link any related issues if applicable.

Scope of Change

Delete items that don’t apply:

• Sync/Import logic
• NetBox models / ORM
• LibreNMS API interaction
• Config / settings
• Web UI / templates
• Database migrations
• Tests
• Docs only
• Other:

How Was This Tested?

Delete items that don’t apply and describe briefly.

• Unit tests: <yes/no + what>
• Manual testing: <yes/no + what>
• Not tested:

Manual Test Steps (if applicable)

Risk Assessment

• Does this change affect existing users?
• Could this cause unintended imports / updates?

Explain briefly.

Backwards Compatibility

• No breaking changes
• Breaking change (explain and document)

Other Notes

Anything the maintainer(s) should pay particular attention to?

Summary by CodeRabbit

Release Notes

• New Features

  • Added multi-server support with per-server LibreNMS ID mapping and automatic isolation of cached data
  • Enhanced virtual chassis detection with improved member position handling and transactional creation
  • Introduced module installation and replacement workflows with preview functionality
  • Added automatic creation of librenms_id custom field during plugin installation

• Bug Fixes

  • Fixed XSS vulnerabilities in cable and interface verification pages
  • Improved virtual chassis member position conflict resolution
  • Enhanced cache isolation to prevent data leakage between servers
  • Corrected disabled device filtering in import operations

• Documentation

  • Updated custom field setup guide to reflect automatic field creation

• Tests

  • Expanded test coverage across import, sync, and caching functionality