release: bump version to v3.3.1

Add support for DeepSeek-V3.1-Terminus model with emergency hotfix release

src-tauri/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cc-switch"
-version = "3.3.0"
+version = "3.3.1"
 description = "Claude Code & Codex 供应商配置管理工具"
 authors = ["Jason Young"]
 license = "MIT"
@@ -30,6 +30,9 @@ tauri-plugin-dialog = "2"
 dirs = "5.0"
 toml = "0.8"
 
+[target.'cfg(any(target_os = "macos", target_os = "windows", target_os = "linux"))'.dependencies]
+tauri-plugin-single-instance = "2"
+
 [target.'cfg(target_os = "macos")'.dependencies]
 objc2 = "0.5"
 objc2-app-kit = { version = "0.2", features = ["NSColor"] }