feat(dashboard): Enhanced chat, spec management, and Claude integration

Backend:
- spec.py: New AtomizerSpec REST API endpoints
- spec_manager.py: SpecManager service for unified config
- interview_engine.py: Study creation interview logic
- claude.py: Enhanced Claude API with context
- optimization.py: Extended optimization endpoints
- context_builder.py, session_manager.py: Improved services

Frontend:
- Chat components: Enhanced message rendering, tool call cards
- Hooks: useClaudeCode, useSpecWebSocket, improved useChat
- Pages: Updated Dashboard, Analysis, Insights, Setup, Home
- Components: ParallelCoordinatesPlot, ParetoPlot improvements
- App.tsx: Route updates for canvas/studio

Infrastructure:
- vite.config.ts: Build configuration updates
- start/stop-dashboard.bat: Script improvements

atomizer-dashboard/frontend/src/components/ParetoPlot.tsx

@@ -8,14 +8,15 @@ import { ScatterChart, Scatter, Line, XAxis, YAxis, CartesianGrid, Tooltip, Cell
 
 interface ParetoTrial {
   trial_number: number;
-  values: [number, number];
+  values: number[];  // Support variable number of objectives
   params: Record<string, number>;
   constraint_satisfied?: boolean;
 }
 
 interface Objective {
   name: string;
-  type: 'minimize' | 'maximize';
+  type?: 'minimize' | 'maximize';
+  direction?: 'minimize' | 'maximize';  // Alternative field used by some configs
   unit?: string;
 }