IAV-532/feat(sav-agents): Complete standard instructions management for SAV agents
This MR introduces full management capabilities for SAV agent standard instructions.
Changes
- API Integration: New client endpoints to fetch and toggle instruction categories
- State Management: Dedicated Zustand store with optimistic updates and proper error handling
- UI Refactor: StandardInstructionsView now consumes live API data with synchronized UI state
Closes IAV-532