feat: Vendor pezkuwi-subxt and pezkuwi-zombienet-sdk into monorepo

- Add pezkuwi-subxt crates to vendor/pezkuwi-subxt
- Add pezkuwi-zombienet-sdk crates to vendor/pezkuwi-zombienet-sdk
- Convert git dependencies to path dependencies
- Add vendor crates to workspace members
- Remove test/example crates from vendor (not needed for SDK)
- Fix feature propagation issues detected by zepter
- Fix workspace inheritance for internal dependencies
- All 606 crates now in workspace
- All 6919 internal dependency links verified correct
- No git dependencies remaining

vendor/pezkuwi-subxt/lightclient/src/platform/mod.rs

@@ -0,0 +1,37 @@
+// Copyright 2019-2025 Parity Technologies (UK) Ltd.
+// This file is dual-licensed as Apache-2.0 or GPL-3.0.
+// see LICENSE for license details.
+
+//! Default platform for WASM environments.
+
+#[cfg(feature = "web")]
+mod wasm_helpers;
+#[cfg(feature = "web")]
+mod wasm_platform;
+#[cfg(feature = "web")]
+mod wasm_socket;
+
+pub use helpers::{DefaultPlatform, build_platform};
+
+#[cfg(feature = "native")]
+mod helpers {
+	use smoldot_light::platform::default::DefaultPlatform as Platform;
+	use std::sync::Arc;
+
+	pub type DefaultPlatform = Arc<Platform>;
+
+	pub fn build_platform() -> DefaultPlatform {
+		Platform::new("subxt-light-client".into(), env!("CARGO_PKG_VERSION").into())
+	}
+}
+
+#[cfg(feature = "web")]
+mod helpers {
+	use super::wasm_platform::SubxtPlatform as Platform;
+
+	pub type DefaultPlatform = Platform;
+
+	pub fn build_platform() -> DefaultPlatform {
+		Platform::new()
+	}
+}