feat: add authentication, user management, and admin features
Added comprehensive authentication and authorization system:
Authentication System:
- Better Auth integration with session management
- Login/logout pages and API routes
- Middleware for route protection
- Auth utilities and client libraries
User Management:
- User list, detail, and invite pages
- User API endpoints (CRUD operations)
- Session management for users
- Profile settings page
Role-Based Access Control:
- Role management pages (list, create, edit)
- Permission system with granular controls
- Role assignment to users
- Role API endpoints
Admin Features:
- Audit log page for tracking system events
- Admin settings page
- Audit service for logging user actions
Additional Features:
- Quotes management pages and components
- SalesBldr API integration
- Email service for notifications
Configuration & Documentation:
- Updated docker-compose.yml
- MCP server configuration (mcp.json)
- CVE-2025-55182 security review documentation
- Standards guide and PRD documents
- Re-enabling authentication documentation
Database Migrations:
- 012: Auth tables (users, sessions, accounts, verifications)
- 013: Role tables (roles, permissions, role_permissions, user_roles)
- 014: Admin settings table
UI Updates:
- Updated dashboard layout
- Enhanced app layout with auth integration
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