feat: scaffold tuimble TUI mumble client

Core modules: TUI app (textual), mumble protocol client,
audio pipeline (sounddevice + opus), push-to-talk with
kitty protocol / evdev / toggle backends. Config via TOML.

README.md

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+# tuimble
+
+TUI Mumble client with voice support and push-to-talk.
+
+## Features
+
+- Terminal-based UI (Textual)
+- Voice transmission with Opus codec
+- Push-to-talk via Kitty keyboard protocol, evdev, or toggle
+- Channel browsing and text chat
+
+## Quick Start
+
+```sh
+make setup
+make run
+```
+
+## Configuration
+
+```sh
+mkdir -p ~/.config/tuimble
+```
+
+`~/.config/tuimble/config.toml`:
+
+```toml
+[server]
+host = "mumble.example.com"
+port = 64738
+username = "myname"
+
+[ptt]
+key = "space"
+mode = "hold"
+backend = "auto"
+```
+
+## Requirements
+
+- Python 3.11+
+- libopus
+- portaudio (libportaudio2)
+- A Mumble server to connect to