- Add created_by field to AppUser model to track who created the user
- Set created_by when agent creates users
- Extract getAgentUserIDs() helper: finds users who recharged with agent/sub-agent cards OR were created by agent/sub-agent
- Extract getAgentAppIDs() helper: finds agent's authorized applications
- Refactor handleGetUsers and checkAgentUserPermission to use getAgentUserIDs
- Create agent-specific handleGetDevices: filter by agent user IDs + app IDs
- Create agent-specific handleGetSessions: filter by agent user IDs + app IDs
- Replace admin handler references with agent-specific handlers for GET routes
admin
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