Restrict transfers to HoF team and prevent blocking starter route

Transfer modal now only appears when a Hall of Fame team is selected,
using the existing hofTeam data instead of the survivors endpoint.
Without a HoF selection, advance proceeds directly with no transfer step.

Transferred encounters are now a separate category: they appear in their
own "Transferred Pokemon" section, don't occupy route slots in the
encounter map, and don't block the route-lock check (excluded via
genlocke_transfers subquery). The run detail endpoint returns
transferEncounterIds so the frontend can distinguish them.

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

frontend/src/types/game.ts

@@ -107,6 +107,7 @@ export interface RunDetail extends NuzlockeRun {
   game: Game
   encounters: EncounterDetail[]
   genlocke: RunGenlockeContext | null
+  transferEncounterIds: number[]
 }
 
 export interface EncounterDetail extends Encounter {