Add Pokemon form support to seeding (Alolan, regional variants, etc.)

Pokemon forms with dex IDs >= 10000 (e.g., Alolan Rattata = 10091) were
being collected in encounter data but missing from pokemon.json, causing
them to be silently dropped during DB seeding. Now fetch_all_pokemon()
also fetches form entries that appear in encounter data, with clean
display names like "Rattata (Alola)" and correct form-specific types.

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

backend/src/app/seeds/data/pokemon.json

@@ -8724,5 +8724,145 @@
       "ghost"
     ],
     "sprite_url": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/1025.png"
+  },
+  {
+    "national_dex": 10016,
+    "name": "Basculin (Blue Striped)",
+    "types": [
+      "water"
+    ],
+    "sprite_url": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/10016.png"
+  },
+  {
+    "national_dex": 10091,
+    "name": "Rattata (Alola)",
+    "types": [
+      "dark",
+      "normal"
+    ],
+    "sprite_url": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/10091.png"
+  },
+  {
+    "national_dex": 10092,
+    "name": "Raticate (Alola)",
+    "types": [
+      "dark",
+      "normal"
+    ],
+    "sprite_url": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/10092.png"
+  },
+  {
+    "national_dex": 10101,
+    "name": "Sandshrew (Alola)",
+    "types": [
+      "ice",
+      "steel"
+    ],
+    "sprite_url": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/10101.png"
+  },
+  {
+    "national_dex": 10103,
+    "name": "Vulpix (Alola)",
+    "types": [
+      "ice"
+    ],
+    "sprite_url": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/10103.png"
+  },
+  {
+    "national_dex": 10105,
+    "name": "Diglett (Alola)",
+    "types": [
+      "ground",
+      "steel"
+    ],
+    "sprite_url": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/10105.png"
+  },
+  {
+    "national_dex": 10106,
+    "name": "Dugtrio (Alola)",
+    "types": [
+      "ground",
+      "steel"
+    ],
+    "sprite_url": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/10106.png"
+  },
+  {
+    "national_dex": 10107,
+    "name": "Meowth (Alola)",
+    "types": [
+      "dark"
+    ],
+    "sprite_url": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/10107.png"
+  },
+  {
+    "national_dex": 10109,
+    "name": "Geodude (Alola)",
+    "types": [
+      "rock",
+      "electric"
+    ],
+    "sprite_url": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/10109.png"
+  },
+  {
+    "national_dex": 10110,
+    "name": "Graveler (Alola)",
+    "types": [
+      "rock",
+      "electric"
+    ],
+    "sprite_url": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/10110.png"
+  },
+  {
+    "national_dex": 10112,
+    "name": "Grimer (Alola)",
+    "types": [
+      "poison",
+      "dark"
+    ],
+    "sprite_url": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/10112.png"
+  },
+  {
+    "national_dex": 10114,
+    "name": "Exeggutor (Alola)",
+    "types": [
+      "grass",
+      "dragon"
+    ],
+    "sprite_url": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/10114.png"
+  },
+  {
+    "national_dex": 10123,
+    "name": "Oricorio (Pom Pom)",
+    "types": [
+      "electric",
+      "flying"
+    ],
+    "sprite_url": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/10123.png"
+  },
+  {
+    "national_dex": 10124,
+    "name": "Oricorio (Pau)",
+    "types": [
+      "psychic",
+      "flying"
+    ],
+    "sprite_url": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/10124.png"
+  },
+  {
+    "national_dex": 10125,
+    "name": "Oricorio (Sensu)",
+    "types": [
+      "ghost",
+      "flying"
+    ],
+    "sprite_url": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/10125.png"
+  },
+  {
+    "national_dex": 10126,
+    "name": "Lycanroc (Midnight)",
+    "types": [
+      "rock"
+    ],
+    "sprite_url": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/10126.png"
   }
 ]