feat: disable discv4, run discv5 on port 30303 by default

DISABLE_DISCV4=true appends --disable-discv4-discovery so callers can
opt in without changing the entrypoint. V5_DISCOVERY_PORT now defaults
to 30303 (same as devp2p TCP) instead of 9200, improving NAT traversal
in environments where only standard p2p ports are allowed outbound.

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Author: meyer9

reth/reth-entrypoint

@@ -127,6 +127,14 @@ if [[ "$RETH_HISTORICAL_PROOFS" == "true" && -n "$RETH_HISTORICAL_PROOFS_STORAGE
         --proofs-history.storage-path=$RETH_HISTORICAL_PROOFS_STORAGE_PATH
 fi
 
+if [[ "${DISABLE_DISCV4:-false}" == "true" ]]; then
+    ADDITIONAL_ARGS="$ADDITIONAL_ARGS --disable-discv4-discovery"
+fi
+
+if [[ "${BASE_DISCOVERY_PROTOCOL:-true}" = "false" ]]; then
+    ADDITIONAL_ARGS="$ADDITIONAL_ARGS --rollup.discovery.v5.base false"
+fi
+
 mkdir -p "$RETH_DATA_DIR"
 echo "Starting reth with additional args: $ADDITIONAL_ARGS"
 echo "$BASE_NODE_L2_ENGINE_AUTH_RAW" > "$BASE_NODE_L2_ENGINE_AUTH"