feat: moved LLMConfigs from User to SearchSpaces

- RBAC soon??
- Updated various services and routes to handle search space-specific LLM preferences.
- Modified frontend components to pass search space ID for LLM configuration management.
- Removed onboarding page and settings page as part of the refactor.

surfsense_web/components/UserDropdown.tsx

@@ -66,10 +66,6 @@ export function UserDropdown({
 					</DropdownMenuItem>
 				</DropdownMenuGroup>
 				<DropdownMenuSeparator />
-				<DropdownMenuItem onClick={() => router.push(`/settings`)}>
-					<Settings className="mr-2 h-4 w-4" />
-					Settings
-				</DropdownMenuItem>
 				<DropdownMenuItem onClick={handleLogout}>
 					<LogOut className="mr-2 h-4 w-4" />
 					Log out