feat: add dependency manager and setup wizard

Co-authored-by: Cursor <cursoragent@cursor.com>

src-tauri/src/commands/dependencies.rs

@@ -1 +1,53 @@
-// Dependency check and install commands — implemented in Task 2
+use serde::Serialize;
+use std::io::{BufRead, BufReader};
+use std::process::{Command, Stdio};
+use tauri::ipc::Channel;
+
+use crate::models::DependencyStatus;
+use crate::services::dependency_manager;
+
+#[tauri::command]
+pub fn check_dependencies() -> Vec<DependencyStatus> {
+    dependency_manager::get_all_dependency_statuses()
+}
+
+#[derive(Clone, Serialize)]
+#[serde(rename_all = "camelCase", tag = "event", content = "data")]
+pub enum InstallEvent {
+    Output { line: String },
+    Finished { success: bool },
+}
+
+#[tauri::command]
+pub async fn install_dependency(
+    name: String,
+    on_event: Channel<InstallEvent>,
+) -> Result<(), String> {
+    let args = dependency_manager::get_install_args(&name)?;
+    let (cmd, cmd_args) = args.split_first().ok_or("Empty install command")?;
+
+    let mut child = Command::new(cmd)
+        .args(cmd_args)
+        .stdout(Stdio::piped())
+        .stderr(Stdio::piped())
+        .spawn()
+        .map_err(|e| format!("Failed to start install: {e}"))?;
+
+    if let Some(stdout) = child.stdout.take() {
+        let reader = BufReader::new(stdout);
+        for line in reader.lines().map_while(Result::ok) {
+            let _ = on_event.send(InstallEvent::Output { line });
+        }
+    }
+
+    let status = child.wait().map_err(|e| format!("Install failed: {e}"))?;
+    let _ = on_event.send(InstallEvent::Finished {
+        success: status.success(),
+    });
+
+    if status.success() {
+        Ok(())
+    } else {
+        Err("Install command exited with non-zero status".to_string())
+    }
+}