IAV-409/feat(public-tender): add agent activation, wizard resume, error codes and UI improvements
- Add activate/deactivate endpoints and service for public tender agent
- Add agent toggle (activate/deactivate) with workflow control in public tender view
- Add wizard resume: redirect user to the step where they left off
- Add mapAdanBackendStepToSlug for backend step to frontend slug mapping
- Add public-tender-error-codes.ts with French error messages for all backend codes
- Replace Autocomplete with MultiSelect component in notifications tabs (wizard + config)
- Add readOnly/disabled prop support in configuration and integration sections
- Add excludeAgentUid filter to fetchUserIntegrations for both legal and public tender wizards
- Show store errors via snackbar in public tender view