Normalise route naming scheme to 'Route X (Region)' format

Standardise 426 inconsistent route names across 33 seed data files
(game data + boss files). Converts 'Region Route X' prefix style and
'Route X - Region' dash style to the consistent 'Route X (Region)' format.

Resolves beans-r48e.

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

backend/src/app/seeds/data/ruby-bosses.json

@@ -35,7 +35,7 @@
     "badge_image_url": "/badges/dynamo-badge.png",
     "level_cap": 23,
     "order": 3,
-    "after_route_name": "Hoenn Route 110",
+    "after_route_name": "Route 110 (Hoenn)",
     "location": "Mauville Gym",
     "section": "Main Story",
     "sprite_url": "/boss-sprites/ruby/wattson.png",