Improve user management and system stability
Add user roles and permissions, enhancing system security and administration capabilities. Replit-Commit-Author: Agent Replit-Commit-Session-Id: aabe2db1-f078-4501-aab5-be145ebc6b9a Replit-Commit-Checkpoint-Type: full_checkpoint Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/3df548ff-50ae-432f-9be4-25d34eccc983/aabe2db1-f078-4501-aab5-be145ebc6b9a/TqVS1Ec
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