Migrate tendermint logging to slog and remove go-kit/log dependency

[masih]

Remove dependency to go-kit/log and logfmt, and adapt existing logging utility libraries to use Go SDK's slog

The changes here intentionally aim to introduce as little changes as possible, and are part of the larger integration of seilog, an extended slog library into sei-chain.

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 27, 2026, 10:51 PM

[codecov]

Codecov Report

❌ Patch coverage is 84.15301% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.60%. Comparing base (1c2910c) to head (0e1d1bb).

Files with missing lines	Patch %	Lines
sei-tendermint/libs/log/tm_logger.go	87.94%	14 Missing and 3 partials ⚠️
sei-tendermint/libs/log/testing_logger.go	33.33%	2 Missing and 2 partials ⚠️
sei-tendermint/libs/log/nop.go	60.00%	2 Missing ⚠️
cmd/seid/cmd/blocktest.go	0.00%	1 Missing ⚠️
cmd/seid/cmd/ethreplay.go	0.00%	1 Missing ⚠️
cmd/seid/cmd/snapshot.go	0.00%	1 Missing ⚠️
sei-cosmos/client/pruning/main.go	0.00%	1 Missing ⚠️
sei-tendermint/libs/log/testing.go	87.50%	1 Missing ⚠️
tools/migration/sc/migrator.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2987       +/-   ##
===========================================
- Coverage   58.17%   46.60%   -11.57%     
===========================================
  Files        2113       39     -2074     
  Lines      173688     4152   -169536     
===========================================
- Hits       101037     1935    -99102     
+ Misses      63622     2063    -61559     
+ Partials     9029      154     -8875     

Flag	Coverage Δ
sei-chain-pr	43.61% <84.15%> (?)
sei-db	70.41% <ø> (ø)

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

Files with missing lines	Coverage Δ
sei-tendermint/internal/p2p/conn/oldmux.go	94.00% <100.00%> (+2.06%)	⬆️
sei-tendermint/libs/log/default.go	100.00% <100.00%> (+25.49%)	⬆️
sei-tendermint/node/node.go	58.13% <100.00%> (-2.07%)	⬇️
cmd/seid/cmd/blocktest.go	0.00% <0.00%> (ø)
cmd/seid/cmd/ethreplay.go	0.00% <0.00%> (ø)
cmd/seid/cmd/snapshot.go	0.00% <0.00%> (ø)
sei-cosmos/client/pruning/main.go	0.00% <0.00%> (ø)
sei-tendermint/libs/log/testing.go	61.53% <87.50%> (+11.53%)	⬆️
tools/migration/sc/migrator.go	0.00% <0.00%> (ø)
sei-tendermint/libs/log/nop.go	66.66% <60.00%> (-33.34%)	⬇️
... and 2 more

... and 2074 files with indirect coverage changes

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[masih]

Coverage drop is miss-leading and a result of partial to full comparison. Fixed separately here: #2989