sharding rpc fixes (CON-320)

[pompon0]

• apparently WS RPC server does not have any timeouts by default, so I have added an explicit timeout for the proxying calls (so that proxy is not waiting forever if server is unresponsive) consistent HTTP RPC server - httpServer.timeouts.WriteTimeout
• I have removed the error wrapping of proxied rpc calls, because evm server is unable to handle the wrapped errors
• removed some deadcode

[cursor]

PR Summary

Medium Risk
Changes behavior for pending nonce/send and cross-shard proxy paths (timeouts and error shape); low blast radius elsewhere but affects transaction submission and nonce queries.

Overview
Hardens EVM RPC sharding by bounding proxied calls and returning errors the upstream shard can interpret.

Timeouts: HTTP and WebSocket servers now derive a shared methodTimeout from WriteTimeout and pass it into SendAPI / TransactionAPI. eth_sendRawTransaction and pending eth_getTransactionCount wrap the request context with that deadline before dialing the shard proxy.

Proxy errors: Successful proxied CallContext failures are returned without fmt.Errorf wrapping so downstream EVM nodes see the original RPC error.

Cleanup: Removes unused StartHTTPEndpoint, stopWS, and moves CheckTimeouts into NewHTTPServer (duplicate call removed from Start). Minor interface{} → any and a TODO on possibly proxying eth_getTransactionByHash for mempool sharding.

^{Reviewed by Cursor Bugbot for commit c3ef6be. Bugbot is set up for automated code reviews on this repo. Configure here.}

[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	Jun 4, 2026, 9:38 AM

[codecov]

Codecov Report

❌ Patch coverage is 92.59259% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.28%. Comparing base (1a1b8cd) to head (c3ef6be).

Files with missing lines	Patch %	Lines
evmrpc/send.go	83.33%	1 Missing ⚠️
evmrpc/tx.go	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3548      +/-   ##
==========================================
- Coverage   59.12%   58.28%   -0.85%     
==========================================
  Files        2218     2144      -74     
  Lines      183132   174548    -8584     
==========================================
- Hits       108285   101729    -6556     
+ Misses      65082    63757    -1325     
+ Partials     9765     9062     -703     

Flag	Coverage Δ
sei-chain-pr	68.33% <92.59%> (?)
sei-db	70.41% <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
evmrpc/endpoints.go	37.50% <ø> (+16.07%)	⬆️
evmrpc/rpcstack.go	78.54% <100.00%> (+1.67%)	⬆️
evmrpc/server.go	88.73% <100.00%> (+0.10%)	⬆️
evmrpc/send.go	51.04% <83.33%> (+1.77%)	⬆️
evmrpc/tx.go	83.48% <91.66%> (+0.25%)	⬆️

... and 74 files with indirect coverage changes

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