fix: simplify Google Maps provider setup

CHANGELOG.md

@@ -13,6 +13,10 @@ of current runtime behavior, see [`docs/CURRENT-STATE.md`](docs/CURRENT-STATE.md
 
 ## [Unreleased]
 
+- Simplify POWER UP to one Google Maps entry. Keep the optional server key
+  available through environment configuration without a second setup row or
+  missing-key reminder.
+
 - Separate terrain, traffic, FIRMS and GBFS middleware into focused provider
   modules, preserving local configuration, routes and cache/error behavior.