fix(evmrpc): treat id=null as a valid request, not a JSON-RPC notification

[amir-deris]

Summary

JSON-RPC 2.0 defines a Notification as a request object with no id member. A request with "id": null is discouraged by the spec but is still a valid call and must receive a response.

The previous implementation of isJSONRPCNotificationID returned true for both a missing id and an explicit "id": null, causing requests with null ids to be silently dropped from batch responses.

Changes

• isJSONRPCNotificationID now returns true only when the raw id field is absent (len(id) == 0), not when it is null
• Added TestWrapSeiLegacyHTTP_BatchNullIDIsNotNotification to verify that a batch containing "id": null forwards the request and includes the response

Test plan

• go test ./evmrpc/... -run TestWrapSeiLegacyHTTP_Batch

[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	Apr 22, 2026, 11:47 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.31%. Comparing base (63f25b1) to head (355d2c5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3303      +/-   ##
==========================================
- Coverage   58.31%   58.31%   -0.01%     
==========================================
  Files        2085     2085              
  Lines      209061   209058       -3     
==========================================
- Hits       121913   121910       -3     
  Misses      78355    78355              
  Partials     8793     8793              

Flag	Coverage Δ
sei-chain-pr	62.60% <100.00%> (?)
sei-db	69.36% <ø> (ø)

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

Files with missing lines	Coverage Δ
evmrpc/sei_legacy_http.go	77.55% <100.00%> (-0.23%)	⬇️

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