feat: Add OSINT features (v0.1.2)

- MAC vendor lookup (IEEE OUI database)
- BLE company_id to manufacturer mapping
- Device profile enrichment in API responses
- Export endpoints: devices.csv, devices.json, alerts.csv, probes.csv
- Auto-populate vendor on device creation
- CLI command: flask download-oui
- Makefile target: make oui

13 tests passing

Makefile

@@ -1,4 +1,4 @@
-.PHONY: help build run dev stop logs test migrate clean install start restart status
+.PHONY: help build run dev stop logs test migrate clean install start restart status oui
 
 APP_NAME := esp32-web
 PORT := 5500
@@ -25,6 +25,7 @@ help:
 	@echo "Development:"
 	@echo "  make install   Install with dev dependencies"
 	@echo "  make test      Run tests"
+	@echo "  make oui       Download OUI database"
 	@echo "  make clean     Remove cache files"
 	@echo ""
 	@echo "Container:"
@@ -81,6 +82,9 @@ dev:
 test:
 	pytest -v
 
+oui:
+	flask --app src/esp32_web download-oui
+
 migrate:
 	flask --app src/esp32_web db upgrade