Remove artificial Starter route, use real PokeDB starter locations

Replace the synthetic "Starter" route with actual in-game locations
(e.g. Professor Oak's Laboratory, Iki Town, Littleroot Town). Starters
now appear at their real locations with method "starter" by remapping
PokeDB's "gift" method during import. Split ruby-sapphire and
black-2-white-2 out of special_encounters aliases since their starter
locations differ from the aliased version groups.

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

backend/src/app/seeds/route_order.json

@@ -2,7 +2,6 @@
   "_comment": "Route progression order by version group. Aliases at the bottom map version groups that share the same ordering.",
   "routes": {
     "firered-leafgreen": [
-      "Starter",
       "Pallet Town",
       "Professor Oak's Laboratory",
       "Route 01 (Kanto)",
@@ -85,7 +84,6 @@
       "Navel Rock"
     ],
     "heartgold-soulsilver": [
-      "Starter",
       "New Bark Town",
       "Route 29 (Johto)",
       "Cherrygrove City",
@@ -191,7 +189,6 @@
       "Sinjoh Ruins"
     ],
     "emerald": [
-      "Starter",
       "Littleroot Town",
       "Hoenn Route 101",
       "Hoenn Route 103",
@@ -276,7 +273,6 @@
       "Navel Rock"
     ],
     "platinum": [
-      "Starter",
       "Twinleaf Town",
       "Lake Verity",
       "Route 201 (Sinnoh)",
@@ -356,7 +352,6 @@
       "Iron Ruins (Sinnoh)"
     ],
     "diamond-pearl": [
-      "Starter",
       "Twinleaf Town",
       "Lake Verity",
       "Route 201 (Sinnoh)",
@@ -430,7 +425,6 @@
       "Rock Peak Ruins (Sinnoh)"
     ],
     "black-white": [
-      "Starter",
       "Nuvema Town",
       "Unova Route 1",
       "Unova Route 2",
@@ -483,7 +477,6 @@
       "Liberty Garden"
     ],
     "black-2-white-2": [
-      "Starter",
       "Aspertia City",
       "Unova Route 19",
       "Floccesy Town",
@@ -550,7 +543,6 @@
       "Nature Preserve"
     ],
     "x-y": [
-      "Starter",
       "Vaniville Town",
       "Aquacorde Town",
       "Kalos Route 02",
@@ -605,7 +597,6 @@
       "Friend Safari"
     ],
     "sun-moon": [
-      "Starter",
       "Iki Town",
       "Alola Route 1",
       "Trainer’s School (Alola)",
@@ -677,7 +668,7 @@
       "Ruins of Conflict"
     ],
     "ultra-sun-ultra-moon": [
-      "Starter",
+      "Iki Town",
       "Alola Route 1",
       "Trainer’s School (Alola)",
       "Hau'oli City",
@@ -762,7 +753,6 @@
       "Ruins of Abundance"
     ],
     "sword-shield": [
-      "Starter",
       "Postwick",
       "Slumbering Weald",
       "Wedgehurst",
@@ -848,7 +838,6 @@
       "Meetup Spot"
     ],
     "brilliant-diamond-shining-pearl": [
-      "Starter",
       "Twinleaf Town",
       "Lake Verity",
       "Route 201 (Sinnoh)",
@@ -943,7 +932,6 @@
       "Hall of Origin"
     ],
     "legends-arceus": [
-      "Starter",
       "Jubilife Village",
       "Aspiration Hill",
       "Floaro Gardens",
@@ -1034,7 +1022,6 @@
       "Lake Verity #2"
     ],
     "scarlet-violet": [
-      "Starter",
       "Cabo Poco",
       "Poco Path",
       "Area One (South Province)",
@@ -1107,7 +1094,6 @@
       "Random (Around Terrarium)"
     ],
     "legends-z-a": [
-      "Starter",
       "Wild Zone 1",
       "Wild Zone 2",
       "Wild Zone 3",