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/x-bosses.json

@@ -63,7 +63,7 @@
     "badge_image_url": "/badges/voltage-badge.png",
     "level_cap": 37,
     "order": 5,
-    "after_route_name": "Kalos Route 13",
+    "after_route_name": "Route 13 (Kalos)",
     "location": "Lumiose Gym",
     "section": "Main Story",
     "sprite_url": "/boss-sprites/x/clemont.png",
@@ -91,7 +91,7 @@
     "badge_image_url": "/badges/psychic-badge.png",
     "level_cap": 44,
     "order": 7,
-    "after_route_name": "Kalos Route 17",
+    "after_route_name": "Route 17 (Kalos)",
     "location": "Anistar Gym",
     "section": "Main Story",
     "sprite_url": "/boss-sprites/x/olympia.png",