initial commit — SIP B2BUA + WebRTC bridge with Rust codec engine

Full-featured SIP router with multi-provider trunking, browser softphone
via WebRTC, real-time Opus/G.722/PCM transcoding in Rust, RNNoise ML
noise suppression, Kokoro neural TTS announcements, and a Lit-based
web dashboard with live call monitoring and REST API.

rust/crates/opus-codec/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "opus-codec"
+version = "0.2.0"
+edition = "2021"
+
+[[bin]]
+name = "opus-codec"
+path = "src/main.rs"
+
+[dependencies]
+audiopus = "0.3.0-rc.0"
+ezk-g722 = "0.1"
+rubato = "0.14"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+base64 = "0.22"
+nnnoiseless = { version = "0.5", default-features = false }