Add TomTom traffic proxy and update profiles for hillshade/traffic layers

- Add /api/traffic/flow proxy route to hide TomTom API key from frontend
- Add tileset_hillshade and traffic config blocks to all three profiles
- Flip has_hillshade and has_traffic_overlay flags in home and regional profiles
- Minimal profile has config blocks but flags remain false (dormant)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

config/profiles/home.yaml

@@ -11,6 +11,15 @@ tileset:
   max_zoom: 15
   attribution: "Protomaps © OSM"
 
+tileset_hillshade:
+  url: "/tiles/hillshade-na.pmtiles"
+  encoding: "terrarium"
+  max_zoom: 12
+
+traffic:
+  provider: "tomtom"
+  proxy_url: "/api/traffic/flow/{z}/{x}/{y}.png"
+
 services:
   geocode: "/api/geocode"
   reverse: "/api/reverse"
@@ -20,9 +29,9 @@ services:
 features:
   has_nominatim_details: false
   has_kiwix_wiki: false
-  has_hillshade: false
+  has_hillshade: true
   has_3d_terrain: false
-  has_traffic_overlay: false
+  has_traffic_overlay: true
   has_landclass: false
   has_address_book_write: false