Refine seed data: route ordering and boss configs up to gen 8 (WIP)

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

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

@@ -119,7 +119,7 @@
     "badge_image_url": null,
     "level_cap": 56,
     "order": 9,
-    "after_route_name": "Victory Road (Kanto)",
+    "after_route_name": "Indigo Plateau",
     "location": "Indigo Plateau",
     "section": null,
     "sprite_url": "/boss-sprites/red/lorelei.png",
@@ -133,7 +133,7 @@
     "badge_image_url": null,
     "level_cap": 58,
     "order": 10,
-    "after_route_name": "Victory Road (Kanto)",
+    "after_route_name": "Indigo Plateau",
     "location": "Indigo Plateau",
     "section": null,
     "sprite_url": "/boss-sprites/red/bruno.png",
@@ -147,7 +147,7 @@
     "badge_image_url": null,
     "level_cap": 60,
     "order": 11,
-    "after_route_name": "Victory Road (Kanto)",
+    "after_route_name": "Indigo Plateau",
     "location": "Indigo Plateau",
     "section": null,
     "sprite_url": "/boss-sprites/red/agatha.png",
@@ -161,7 +161,7 @@
     "badge_image_url": null,
     "level_cap": 62,
     "order": 12,
-    "after_route_name": "Victory Road (Kanto)",
+    "after_route_name": "Indigo Plateau",
     "location": "Indigo Plateau",
     "section": null,
     "sprite_url": "/boss-sprites/red/lance.png",
@@ -175,7 +175,7 @@
     "badge_image_url": null,
     "level_cap": 65,
     "order": 13,
-    "after_route_name": "Victory Road (Kanto)",
+    "after_route_name": "Indigo Plateau",
     "location": "Indigo Plateau",
     "section": null,
     "sprite_url": "/boss-sprites/red/blue.png",