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.

Cargo.lock

@@ -2528,6 +2528,15 @@ dependencies = [
  "windows 0.52.0",
 ]
 
+[[package]]
+name = "easytier-mini"
+version = "2.6.4"
+dependencies = [
+ "anyhow",
+ "easytier",
+ "tokio",
+]
+
 [[package]]
 name = "easytier-proto"
 version = "2.6.4"