release: deepseek tui 0.4.6

Bundles new work since v0.4.4: NIM provider support, file mention
attachments, provider switch UX, setup --status/--clean/--tools/--plugins,
doctor --json, and protocol-recovery hardening that strips fake
tool-call wrappers from streaming model output.

Cargo.toml

@@ -18,7 +18,7 @@ default-members = ["crates/cli", "crates/app-server", "crates/tui"]
 resolver = "2"
 
 [workspace.package]
-version = "0.4.5"
+version = "0.4.6"
 edition = "2024"
 license = "MIT"
 repository = "https://github.com/Hmbown/DeepSeek-TUI"