Refactor: Update frontend for research management

[Brad-Edwards]

Description

Update the React frontend to support the new research management domain, replacing requirements management UI with pages for papers, experiments, and notes.

Scope

• Remove requirements-related pages and components
• Add new pages:
  • Papers: List, detail, and create/edit views for research papers
  • Experiments: List, detail, lifecycle tracking with state visualization
  • Research Notes: List, detail, create/edit with rich text support
• Citation Graph: Interactive visualization of paper citation relationships
• Research Dashboard: Overview of papers, active experiments, recent notes, and key metrics
• Update navigation and routing
• Update API service layer to call new backend endpoints

Acceptance Criteria

• Papers page with list/detail/create views
• Experiments page with lifecycle state visualization
• Research notes page with filtering by type
• Citation graph visualization
• Research dashboard with aggregated metrics
• All old requirements UI removed
• Responsive design maintained
• Frontend linting passes