feat(agentcompany-rust): scaffold native shell and runtime bridge

AgentCompany-Rust/crates/app_models/src/actions.rs

@@ -0,0 +1,13 @@
+use domain::SectionId;
+
+#[derive(Clone, Debug)]
+pub enum AppAction {
+    SelectSection(SectionId),
+    SelectRun(Option<String>),
+    SelectApproval(Option<String>),
+    SelectMessage(Option<String>),
+    SelectDocument(Option<String>),
+    SelectWorkspace(Option<String>),
+    Status(String),
+    ClearStatus,
+}