Backport release/v6.7: feat(seidb): Add JSON output to evm-logical-digest and inspect a FlatKV migration in flight

[seidroid]

Backport of #4166 to release/v6.7.

[seidroid]

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin backport-4166-to-release/v6.7
git worktree add --checkout .worktree/backport-4166-to-release/v6.7 backport-4166-to-release/v6.7
cd .worktree/backport-4166-to-release/v6.7
git reset --hard HEAD^
git cherry-pick -x 29139f27297d719a0732d413eae2ca727d52b8e0
git push --force-with-lease

[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	Sep 18, 2026, 8:28 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.35%. Comparing base (e59189e) to head (d2e8157).

Additional details and impacted files

@@               Coverage Diff                @@
##           release/v6.7    #4255      +/-   ##
================================================
- Coverage         61.34%   60.35%   -0.99%     
================================================
  Files              2163     2064      -99     
  Lines            188785   176945   -11840     
================================================
- Hits             115813   106802    -9011     
+ Misses            62254    60368    -1886     
+ Partials          10718     9775     -943     

Flag	Coverage Δ
sei-db	69.80% <ø> (ø)
sei-db-state-db	?

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

Files with missing lines	Coverage Δ
sei-db/tools/cmd/seidb/main.go	0.00% <ø> (ø)
...b/tools/cmd/seidb/operations/evm_logical_digest.go	26.51% <ø> (+3.59%)	⬆️

... and 99 files with indirect coverage changes

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