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

mcp.json

@@ -0,0 +1,12 @@
+{
+  "mcpServers": {
+    "postgres": {
+      "command": "npx",
+      "args": [
+        "-y",
+        "@modelcontextprotocol/server-postgres",
+        "postgresql://pulse_user:9KuYTjjGEB7NsJc_togj6R9wYLRRrhudZiR4%40i%40N@localhost:5432/pulse_autotask"
+      ]
+    }
+  }
+}