re.escape() escapes '-' as '\-', which Python's regex engine accepts
but PromQL's RE2 engine rejects outright (every hostname in this lab
is hyphenated, e.g. dc-leaf1). All 4 panel targets were failing with
"unknown escape sequence U+002D" until now. Also swaps the dashboard
to the newly-created NetLab datasource, which actually has gnmic data
(the previously-wired external Prometheus datasource had none).
Refs #48
Adds scripts/generate_weathermap.py: fetches device inventory and
connectivity-matrix from IPFabric, cross-checks IPFabric's abbreviated
interface names against the live gnmic exporter, and emits a Grafana
dashboard-as-code JSON (configs/grafana/weathermap-dashboard.json) with
the weathermap-ng panel wired to explicit legendFormat-resolved queries
for BGP status, interface tx/rx, and VXLAN MAC-per-VNI.
Refs #48
