Flatten sei-db module

[masih]

Remove sei-db as a nested go module and instead flatten it into sei-chain top level module.

This simplifies the go module structure and removes one degree of complexity from workspace management.

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Dec 9, 2025, 2:42 PM

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.20%. Comparing base (c72eccf) to head (6c94af8).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
sei-db/ss/pebbledb/db.go	0.00%	9 Missing ⚠️
x/evm/client/cli/common.go	0.00%	7 Missing ⚠️
sei-db/sc/memiavl/snapshot.go	37.50%	5 Missing ⚠️
sei-db/ss/test/storage_test_suite.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2587      +/-   ##
==========================================
+ Coverage   42.00%   43.20%   +1.20%     
==========================================
  Files        1510     1856     +346     
  Lines      118778   152688   +33910     
==========================================
+ Hits        49891    65970   +16079     
- Misses      64558    80834   +16276     
- Partials     4329     5884    +1555     

Flag	Coverage Δ
sei-chain	42.08% <33.33%> (+0.18%)	⬆️
sei-cosmos	37.95% <ø> (+<0.01%)	⬆️
sei-db	69.06% <ø> (+24.08%)	⬆️
sei-ibc-go	55.96% <ø> (ø)
sei-tendermint	47.39% <ø> (?)
sei-wasmd	42.11% <ø> (+0.01%)	⬆️
sei-wasmvm	39.88% <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	76.51% <ø> (ø)
app/params/proto.go	0.00% <ø> (ø)
app/seidb.go	82.69% <ø> (ø)
app/test_helpers.go	31.42% <ø> (ø)
cmd/seid/cmd/app_config.go	100.00% <ø> (ø)
cmd/seid/cmd/root.go	0.00% <ø> (ø)
evmrpc/server.go	91.19% <ø> (ø)
evmrpc/watermark_manager.go	74.46% <ø> (ø)
sei-cosmos/server/config/config.go	94.56% <ø> (ø)
sei-cosmos/storev2/commitment/store.go	9.37% <ø> (ø)
... and 52 more

... and 348 files with indirect coverage changes

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[pompon0]

fyi, btree gets reverted to an older version

[masih]

Yeah this also caught my eye thanks for pointing that out.

This is a transitive dependency. Taking a closer look to see why this happened.

[masih]

After a closer look, this is in go wor sum, and a result of running go work sync. The indirect dependency in sei-chain remains 1.1.3 which is the one ends up being used in the built binary.