Harden docker callback parsing and remove duplicate /openwrt handler

handlers/callbacks.py

@@ -15,8 +15,15 @@ async def docker_callback(cb: CallbackQuery):
     if cb.from_user.id != ADMIN_ID:
         return
 
-    _, action, alias = cb.data.split(":", 2)
-    real = DOCKER_MAP[alias]
+    try:
+        _, action, alias = cb.data.split(":", 2)
+    except ValueError:
+        await cb.answer("Bad request")
+        return
+    real = DOCKER_MAP.get(alias)
+    if not real:
+        await cb.answer("Container not found")
+        return
 
     if action == "restart":
         await cb.answer("Restarting…")