fix: add subxt native feature propagation to umbrella node feature

pezkuwi-subxt, pezkuwi-subxt-rpcs, and pezkuwi-subxt-lightclient
all require either 'native' or 'web' feature to be enabled. When
umbrella's node feature enables these dependencies with
default-features = false, the default 'native' feature is not
propagated, causing compile_error! in all three crates.

Added "dep?/native" propagation for all three subxt crates in
the node feature.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

umbrella/Cargo.toml

@@ -1067,12 +1067,15 @@ node = [
 	"pezkuwi-statement-distribution",
 	"pezkuwi-statement-table",
 	"pezkuwi-subxt",
+	"pezkuwi-subxt?/native",
 	"pezkuwi-subxt-codegen",
 	"pezkuwi-subxt-core",
 	"pezkuwi-subxt-lightclient",
+	"pezkuwi-subxt-lightclient?/native",
 	"pezkuwi-subxt-macro",
 	"pezkuwi-subxt-metadata",
 	"pezkuwi-subxt-rpcs",
+	"pezkuwi-subxt-rpcs?/native",
 	"pezkuwi-subxt-signer",
 	"pezkuwi-subxt-utils-fetchmetadata",
 	"pezkuwi-subxt-utils-stripmetadata",