chore: add init mode full default biding address

[mojtaba-esk]

Describe your changes and provide context

A change was done by #2903 was accidentally removed by #2793
This PR attempts to add them back + a doc change.

Testing performed to validate your change

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 18, 2026, 3:13 PM

[codecov]

Codecov Report

❌ Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.24%. Comparing base (07025b9) to head (abdf78d).

Files with missing lines	Patch %	Lines
cmd/seid/cmd/init.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2913      +/-   ##
==========================================
+ Coverage   57.22%   57.24%   +0.02%     
==========================================
  Files        2094     2099       +5     
  Lines      171956   172413     +457     
==========================================
+ Hits        98400    98697     +297     
- Misses      64739    64862     +123     
- Partials     8817     8854      +37     

Flag	Coverage Δ
sei-chain	52.72% <40.00%> (-0.02%)	⬇️
sei-cosmos	48.19% <ø> (ø)
sei-db	68.72% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
app/params/config.go	86.66% <100.00%> (+0.36%)	⬆️
cmd/seid/cmd/init.go	26.17% <0.00%> (-0.18%)	⬇️

... and 35 files with indirect coverage changes

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