feat: GeoScene frontend POC + Docker deploy for remote host

Migrate maps to @geoscene/core, polish monitoring/alerts UX, fix timeline
basemap flicker and district alert regions, and ship compose/nginx Docker
deploy assets with CBPOA_ROOT data mounts.

Co-authored-by: Cursor <cursoragent@cursor.com>

processed/daily_avg_risk.json

@@ -0,0 +1 @@
+{"20231125":0.4461,"20231126":0.4517,"20231127":0.4576,"20231128":0.4638,"20231129":0.4697,"20231130":0.4521,"20231201":0.4581}