Fix: ndppd proxy not loading existing interfaces on supervisor restart

[nesitor]

When aleph-vm-supervisor restarts, it properly loads existing VM interfaces but doesn't re-add their IPv6 ranges to the ndppd proxy configuration. This change explicitly re-adds ndp_proxy rules for existing interfaces during VM recovery.

Self proofreading checklist

• The new code clear, easy to read and well commented.
• New code does not duplicate the functions of builtin or popular libraries.
• An LLM was used to review the new code and look for simplifications.
• New classes and functions contain docstrings explaining what they provide.
• All new code is covered by relevant tests.
• Documentation has been updated regarding these changes.
• Dependencies update in the project.toml have been mirrored in the Debian package build script packaging/Makefile

Changes

Added lines to load existing interfaces to ndppd software for the supervisor restart.

How to test

Update a CRN with last version and ensure it loads all ndppd proxy lines of all interfaces.

Notes

🤖 Generated with Claude Code
Co-Authored-By: Claude [email protected]

[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 64.75%. Comparing base (9f6351e) to head (35320c9).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/aleph/vm/network/ndp_proxy.py	33.33%	4 Missing ⚠️
src/aleph/vm/pool.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #783      +/-   ##
==========================================
- Coverage   64.80%   64.75%   -0.06%     
==========================================
  Files          78       78              
  Lines        7058     7064       +6     
  Branches      587      590       +3     
==========================================
  Hits         4574     4574              
- Misses       2283     2289       +6     
  Partials      201      201              

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