feat(mini): add compact native EasyTier client (#2479)

Add a native EasyTier proof-of-concept binary with TCP and UDP
transports, TUN, UDP hole punching, AES-GCM, and a read-only RPC
portal.

Introduce a release-derived mini profile and musl linker policy so
x86_64, big-endian MIPS, and little-endian MIPS stay below the strict
5,000,000-byte target without UPX.

easytier/src/lib.rs

@@ -20,7 +20,7 @@ pub mod service_manager;
 pub(crate) mod socket;
 pub mod tunnel;
 pub mod utils;
-#[cfg(feature = "management")]
+#[cfg(feature = "web-client")]
 pub mod web_client;
 
 #[cfg(test)]