fix(app): Normalize provisioning templates and Clerk props

Use autoescape for Jinja rendering to satisfy bandit checks and\nremove deprecated Clerk SignInButton props to restore type checks.\nAlso ignore tsbuildinfo artifacts and tidy boot instructions.\n\nCo-Authored-By: Claude <noreply@anthropic.com>

backend/app/schemas/agents.py

@@ -8,7 +8,7 @@ from sqlmodel import SQLModel
 
 class AgentBase(SQLModel):
     name: str
-    status: str = "online"
+    status: str = "provisioning"
 
 
 class AgentCreate(AgentBase):
@@ -23,7 +23,7 @@ class AgentUpdate(SQLModel):
 class AgentRead(AgentBase):
     id: UUID
     openclaw_session_id: str | None = None
-    last_seen_at: datetime
+    last_seen_at: datetime | None
     created_at: datetime
     updated_at: datetime