feat: Add professional web-based optimization dashboard

Complete dashboard UI for controlling and monitoring optimization runs.

Backend API (Flask):
- RESTful endpoints for study management
- Start/stop/resume optimization runs
- Real-time status monitoring
- Configuration management
- Visualization data endpoints

Frontend (HTML/CSS/JS + Chart.js):
- Modern gradient design with cards and charts
- Study list sidebar with metadata
- Active optimizations monitoring (5s polling)
- Interactive charts (progress, design vars, constraints)
- Trial history table
- New optimization modal
- Resume/delete study actions

Features:
- List all studies with trial counts
- View detailed study results
- Start new optimizations from UI
- Resume existing studies with additional trials
- Real-time progress monitoring
- Delete unwanted studies
- Chart.js visualizations (progress, DVs, constraints)
- Configuration file selection
- Study metadata tracking

Usage:
  python dashboard/start_dashboard.py
  # Opens browser to http://localhost:5000

Dependencies:
  flask, flask-cors (auto-installed)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

dashboard/requirements.txt

@@ -0,0 +1,2 @@
+flask>=2.3.0
+flask-cors>=4.0.0