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/ultra-sun-bosses.json

@@ -35,7 +35,7 @@
     "badge_image_url": null,
     "level_cap": 24,
     "order": 3,
-    "after_route_name": "Alola Route 5",
+    "after_route_name": "Route 5 (Alola)",
     "location": "Brooklet Hill",
     "section": "Akala Island",
     "sprite_url": "/sprites/752.webp",
@@ -63,7 +63,7 @@
     "badge_image_url": null,
     "level_cap": 24,
     "order": 5,
-    "after_route_name": "Alola Route 8",
+    "after_route_name": "Route 8 (Alola)",
     "location": "Lush Jungle",
     "section": "Akala Island",
     "sprite_url": "/sprites/754.webp",
@@ -105,7 +105,7 @@
     "badge_image_url": null,
     "level_cap": 33,
     "order": 8,
-    "after_route_name": "Alola Route 14",
+    "after_route_name": "Route 14 (Alola)",
     "location": "Thrifty Megamart",
     "section": "Ula'ula Island",
     "sprite_url": "/sprites/778.webp",
@@ -119,7 +119,7 @@
     "badge_image_url": null,
     "level_cap": 34,
     "order": 9,
-    "after_route_name": "Alola Route 17",
+    "after_route_name": "Route 17 (Alola)",
     "location": "Malie City",
     "section": "Ula'ula Island",
     "sprite_url": "/boss-sprites/ultra-sun/nanu.png",