feat: v0.1.4 — device intelligence dashboard

Add tabbed dashboard at /dashboard/ with three D3.js visualizations:
- Vendor treemap (devices grouped by type and vendor)
- SSID social graph (force-directed, shared probed SSIDs as edges)
- Fingerprint clusters (packed circles by device behavior)

Intelligence API endpoints at /api/v1/intelligence/ with param
validation. Dashboard built on htmx + Pico CSS dark theme + D3 v7,
all vendored locally (make vendor). 13 new tests (59 total).

Containerfile

@@ -9,6 +9,8 @@ RUN pip install --no-cache-dir .
 # Copy source
 COPY src/ src/
 COPY migrations/ migrations/
+COPY static/ static/
+COPY templates/ templates/
 
 # Expose ports (TCP for HTTP, UDP for collector)
 EXPOSE 5500/tcp