chore: scaffold tvctl foundation

Set up the Rust crate, baseline module layout, and project docs so the
repository matches the design bundle and builds cleanly as a starting point.

src/cli/mod.rs

@@ -0,0 +1,47 @@
+use clap::{Parser, Subcommand};
+
+/// The tvctl command-line interface.
+#[derive(Debug, Parser)]
+#[command(
+    name = "tvctl",
+    version,
+    about = "A local-first daemon and CLI for controlling smart TVs."
+)]
+pub struct Cli {
+    /// Target a specific device by friendly name or UUID.
+    #[arg(long, global = true)]
+    pub device: Option<String>,
+
+    /// Emit JSON output suitable for scripting.
+    #[arg(long, global = true)]
+    pub json: bool,
+
+    /// The resource-oriented command to execute.
+    #[command(subcommand)]
+    pub command: Option<Command>,
+}
+
+/// The top-level resource namespaces exposed by tvctl.
+#[derive(Debug, Subcommand)]
+pub enum Command {
+    /// Manage the background daemon.
+    Daemon,
+    /// Discover and manage devices.
+    Device,
+    /// List, launch, and stop applications.
+    App,
+    /// Send remote control input.
+    Remote,
+    /// Query device state.
+    State,
+    /// Use developer-oriented TV features.
+    Dev,
+    /// Inspect and modify tvctl configuration.
+    Config,
+}
+
+/// Parse the CLI and return successfully for the repository scaffold.
+pub async fn run() -> anyhow::Result<()> {
+    let _ = Cli::parse();
+    Ok(())
+}