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/instance/mod.rs

@@ -1,4 +1,4 @@
-#[cfg(feature = "management")]
+#[cfg(feature = "logging")]
 pub(crate) mod cli_event_logger;
 pub(crate) mod composition;
 pub(crate) mod config;