feat: add well-known port constants and NodePorts()

Exposes canonical Sei node port numbers (RPC, P2P, gRPC, EVM, metrics,
sidecar) as typed int32 constants so consumers like sei-k8s-controller
don't need to maintain their own copies. Also adds NodePorts() which
returns the name→port pairs for container/service port generation.

The EVM defaults in baseDefaults() now reference PortEVMHTTP/PortEVMWS
instead of bare literals.

Author: bdchatham

config.go

@@ -14,6 +14,36 @@ const CurrentVersion = 1
 // creation interval (in blocks) used when snapshot generation is enabled.
 const DefaultSnapshotInterval = 2000
 
+// Well-known default ports for Sei node services and the sidecar.
+const (
+	PortEVMHTTP int32 = 8545
+	PortEVMWS   int32 = 8546
+	PortGRPC    int32 = 9090
+	PortP2P     int32 = 26656
+	PortRPC     int32 = 26657
+	PortMetrics int32 = 26660
+	PortSidecar int32 = 7777
+)
+
+// NodePort pairs a human-readable service name with its default port number.
+type NodePort struct {
+	Name string
+	Port int32
+}
+
+// NodePorts returns the canonical set of ports exposed by a Sei node (seid).
+// The sidecar port is excluded; use PortSidecar directly.
+func NodePorts() []NodePort {
+	return []NodePort{
+		{"evm-rpc", PortEVMHTTP},
+		{"evm-ws", PortEVMWS},
+		{"grpc", PortGRPC},
+		{"p2p", PortP2P},
+		{"rpc", PortRPC},
+		{"metrics", PortMetrics},
+	}
+}
+
 // Pruning strategy constants.
 const (
 	PruningDefault    = "default"

defaults.go

@@ -139,9 +139,9 @@ func baseDefaults() *SeiConfig {
 
 		EVM: EVMConfig{
 			HTTPEnabled:                  true,
-			HTTPPort:                     8545,
+			HTTPPort:                     int(PortEVMHTTP),
 			WSEnabled:                    true,
-			WSPort:                       8546,
+			WSPort:                       int(PortEVMWS),
 			ReadTimeout:                  Dur(30 * time.Second),
 			ReadHeaderTimeout:            Dur(30 * time.Second),
 			WriteTimeout:                 Dur(30 * time.Second),