idz: Remove profile ext id

Turns out (while researching team creation) the profile ext id
is just the aime id. After creating a team a profile discovery
request is immediately issued with the "profile id" in the field
that holds the aime id during initial profile load.

src/idz/model/profile.ts

@@ -1,8 +1,9 @@
 import { ExtId } from "./base";
 import { Team } from "./team";
+import { AimeId } from "../../model";
 
 export interface Profile {
-  id: ExtId<Profile>;
+  aimeId: AimeId;
   teamId?: ExtId<Team>;
   name: string;
   lv: number;