Add autostart manager with XDG autostart support

src/core/database.rs

@@ -1744,6 +1744,16 @@ impl Database {
         Ok(self.conn.last_insert_rowid())
     }
 
+    // --- Autostart ---
+
+    pub fn set_autostart(&self, id: i64, enabled: bool) -> SqlResult<()> {
+        self.conn.execute(
+            "UPDATE appimages SET autostart = ?2 WHERE id = ?1",
+            params![id, enabled as i32],
+        )?;
+        Ok(())
+    }
+
     // --- Launch statistics ---
 
     pub fn get_top_launched(&self, limit: i32) -> SqlResult<Vec<(String, u64)>> {