perf(erpc:PLA-687): cap generic batch concurrency with worker pool

[0x666c6f]

Summary

• replace unbounded per-request goroutine fanout for generic HTTP JSON-RPC batches with a bounded worker pool
• add server config knob server.maxBatchConcurrency (default 32)
• preserve response ordering semantics while reducing goroutine pressure on large batches

Changes

• erpc/http_server.go
• add batchWorkerConcurrency helper
• process batch requests via worker-pool + indexed jobs channel
• common/config.go
• add server.maxBatchConcurrency
• common/defaults.go
• default server.maxBatchConcurrency to 32
• common/validation.go
• validate server.maxBatchConcurrency > 0
• tests:
  • common/config_test.go: default + validation test
  • erpc/http_server_test.go: batch worker concurrency behavior test

Linear

• TICKET: https://linear.app/morpho-labs/issue/PLA-687/erpc-add-bounded-worker-pool-for-generic-http-batch-execution

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