refactor: update internal helpers and improve slugify function usage

backend/app/services/openclaw/internal/agent_key.py

@@ -9,7 +9,7 @@ from app.models.agents import Agent
 from app.services.openclaw.constants import _SESSION_KEY_PARTS_MIN
 
 
-def _slugify(value: str) -> str:
+def slugify(value: str) -> str:
     slug = re.sub(r"[^a-z0-9]+", "-", value.lower()).strip("-")
     return slug or uuid4().hex
 
@@ -21,4 +21,4 @@ def agent_key(agent: Agent) -> str:
         parts = session_key.split(":")
         if len(parts) >= _SESSION_KEY_PARTS_MIN and parts[1]:
             return parts[1]
-    return _slugify(agent.name)
+    return slugify(agent.name)