refactor CheckTx

[codchen]

Describe your changes and provide context

Consolidate ante logics for CheckTx and separate Cosmos vs. EVM paths. Specifically stateless checks are explicitly encapsulated for future parallelizations.

Note that the refactor removed some duplicated param reads so it will affect gas usage for Cosmos txs and hence app hash breaking.

Testing performed to validate your change

unit tests

[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	Nov 21, 2025, 3:38 AM

[codecov]

Codecov Report

❌ Patch coverage is 1.58046% with 685 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.40%. Comparing base (3163a2a) to head (a83f8e0).

Files with missing lines	Patch %	Lines
app/ante/cosmos_checktx.go	0.00%	340 Missing ⚠️
app/ante/evm_checktx.go	0.00%	226 Missing ⚠️
app/legacyabci/check_tx.go	0.00%	44 Missing ⚠️
app/legacyabci/recovery.go	0.00%	44 Missing ⚠️
app/abci.go	0.00%	30 Missing ⚠️
x/evm/ante/preprocess.go	50.00%	0 Missing and 1 partial ⚠️

❌ Your patch check has failed because the patch coverage (1.58%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2553      +/-   ##
==========================================
+ Coverage   43.33%   44.40%   +1.06%     
==========================================
  Files        1586      965     -621     
  Lines      136804    88734   -48070     
==========================================
- Hits        59286    39403   -19883     
+ Misses      72034    45650   -26384     
+ Partials     5484     3681    -1803     

Flag	Coverage Δ
sei-chain	42.14% <1.43%> (-0.82%)	⬇️
sei-cosmos	?
sei-db	44.92% <ø> (-0.07%)	⬇️
sei-tendermint	47.11% <ø> (-0.15%)	⬇️
sei-wasmd	42.57% <100.00%> (-0.02%)	⬇️
sei-wasmvm	39.65% <ø> (ø)

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

Files with missing lines	Coverage Δ
app/app.go	75.59% <100.00%> (+0.11%)	⬆️
x/evm/ante/preprocess.go	77.50% <50.00%> (ø)
app/abci.go	44.57% <0.00%> (-23.95%)	⬇️
app/legacyabci/check_tx.go	0.00% <0.00%> (ø)
app/legacyabci/recovery.go	0.00% <0.00%> (ø)
app/ante/evm_checktx.go	0.00% <0.00%> (ø)
app/ante/cosmos_checktx.go	0.00% <0.00%> (ø)

... and 641 files with indirect coverage changes

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