feat: interactive network map, IOC highlighting, AUP hunt selector, type filters

- NetworkMap: hunt-scoped force-directed graph with click-to-inspect popover
- NetworkMap: zoom/pan (wheel, drag, buttons), viewport transform
- NetworkMap: clickable IP/Host/Domain/URL legend chips to filter node types
- NetworkMap: brighter colors, 20% smaller nodes
- DatasetViewer: IOC columns highlighted with colored headers + cell tinting
- AUPScanner: hunt dropdown replacing dataset checkboxes, auto-select all
- Rename 'Social Media (Personal)' theme to 'Social Media' with DB migration
- Fix /api/hunts timeout: Dataset.rows lazy='noload' (was selectin cascade)
- Add OS column mapping to normalizer
- Full backend services, DB models, alembic migrations, new routes
- New components: Dashboard, HuntManager, FileUpload, NetworkMap, etc.
- Docker Compose deployment with nginx reverse proxy

Dockerfile.backend

@@ -1,11 +1,11 @@
-# ThreatHunt Backend API - Python 3.11
-FROM python:3.11-slim
+# ThreatHunt Backend API - Python 3.13
+FROM python:3.13-slim
 
 WORKDIR /app
 
 # Install system dependencies
 RUN apt-get update && apt-get install -y --no-install-recommends \
-    gcc \
+    gcc curl \
     && rm -rf /var/lib/apt/lists/*
 
 # Copy requirements
@@ -17,16 +17,16 @@ RUN pip install --no-cache-dir -r requirements.txt
 # Copy backend code
 COPY backend/ .
 
-# Create non-root user
-RUN useradd -m -u 1000 appuser && chown -R appuser:appuser /app
+# Create non-root user & data directory
+RUN useradd -m -u 1000 appuser && mkdir -p /app/data && chown -R appuser:appuser /app
 USER appuser
 
 # Expose port
 EXPOSE 8000
 
 # Health check
-HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
-    CMD python -c "import requests; requests.get('http://localhost:8000/api/agent/health')"
+HEALTHCHECK --interval=30s --timeout=10s --start-period=10s --retries=3 \
+    CMD curl -f http://localhost:8000/ || exit 1
 
-# Run application
-CMD ["python", "run.py"]
+# Run Alembic migrations then start Uvicorn
+CMD ["sh", "-c", "python -m alembic upgrade head && python run.py"]