fix(edge_utils): update memcpy to use n3n_sock_t for destination

[SerinaNya]

When processing IPv6 addresses, using the smaller sizeof(struct sockaddr_in) causes the last 4 bytes of data to be truncated or retain old values.

This fix ensures the complete n3n_sock_t structure is copied correctly, resolving the IPv6 address truncation issue, which is mentioned in #21 (comment).

✅ I have already tested this change, it works properly.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 48.86%. Comparing base (befa0be) to head (156e3d7).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
src/edge_utils.c	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #127      +/-   ##
==========================================
- Coverage   48.87%   48.86%   -0.01%     
==========================================
  Files          54       54              
  Lines       10570    10570              
==========================================
- Hits         5166     5165       -1     
- Misses       5404     5405       +1     

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[hamishcoleman]

Thanks!