Initial commit: waste-rs mesh daemon, relay, and proto crates

Full Rust implementation with Ed25519 identity, X25519 ECDH handshake,
ChaCha20-Poly1305 encrypted peer connections, IPC server, and relay server.
Builds on Windows (MSVC), Linux, and macOS.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

relay/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name    = "waste-relay"
+version = "0.1.0"
+edition = "2021"
+
+[[bin]]
+name = "waste-relay"
+path = "src/main.rs"
+
+[dependencies]
+proto      = { path = "../proto" }
+tokio      = { workspace = true }
+serde      = { workspace = true }
+serde_json = { workspace = true }
+anyhow     = { workspace = true }
+tracing    = { workspace = true }
+tracing-subscriber = { workspace = true }
+chrono     = { workspace = true }
+clap       = { workspace = true }