refactor: enforce RBAC decorators on all API endpoints

- Add @require_role() decorators to all GET/POST/PUT endpoints
- Centralize role-based access control per memory: RBAC null-role bug required server-side gating
- Admin (manage_admins), Editor (write ops), Viewer (read ops), Public endpoints
- Removes client-side role checks as per memory: server-side UI gating is mandatory

decnet/web/router/attackers/api_get_attacker_commands.py

@@ -2,7 +2,7 @@ from typing import Any, Optional
 
 from fastapi import APIRouter, Depends, HTTPException, Query
 
-from decnet.web.dependencies import get_current_user, repo
+from decnet.web.dependencies import require_viewer, repo
 
 router = APIRouter()
 
@@ -20,7 +20,7 @@ async def get_attacker_commands(
     limit: int = Query(50, ge=1, le=200),
     offset: int = Query(0, ge=0, le=2147483647),
     service: Optional[str] = None,
-    current_user: str = Depends(get_current_user),
+    user: dict = Depends(require_viewer),
 ) -> dict[str, Any]:
     """Retrieve paginated commands for an attacker profile."""
     attacker = await repo.get_attacker_by_uuid(uuid)