Improve admin panel UX with toasts, evolution CRUD, sorting, drag-and-drop, and responsive layout

Add sonner toast notifications to all mutations, evolution management backend
(CRUD endpoints with search/pagination) and frontend (form modal with pokemon
selector, paginated list page), sortable AdminTable columns (Region/Gen/Year
on Games), drag-and-drop route reordering via @dnd-kit, skeleton loading states,
card-styled table wrappers, and responsive mobile nav in AdminLayout.

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

backend/src/app/schemas/pokemon.py

@@ -86,3 +86,46 @@ class BulkImportResult(CamelModel):
     created: int
     updated: int
     errors: list[str]
+
+
+# --- Evolution admin schemas ---
+
+
+class EvolutionAdminResponse(CamelModel):
+    id: int
+    from_pokemon_id: int
+    to_pokemon_id: int
+    from_pokemon: PokemonResponse
+    to_pokemon: PokemonResponse
+    trigger: str
+    min_level: int | None
+    item: str | None
+    held_item: str | None
+    condition: str | None
+
+
+class PaginatedEvolutionResponse(CamelModel):
+    items: list[EvolutionAdminResponse]
+    total: int
+    limit: int
+    offset: int
+
+
+class EvolutionCreate(CamelModel):
+    from_pokemon_id: int
+    to_pokemon_id: int
+    trigger: str
+    min_level: int | None = None
+    item: str | None = None
+    held_item: str | None = None
+    condition: str | None = None
+
+
+class EvolutionUpdate(CamelModel):
+    from_pokemon_id: int | None = None
+    to_pokemon_id: int | None = None
+    trigger: str | None = None
+    min_level: int | None = None
+    item: str | None = None
+    held_item: str | None = None
+    condition: str | None = None