feat: wire HuntingController/HuntingModule and enrich current-location with monster pool

Registers HuntingModule (POST /api/hunts) into the DI graph alongside its
new entities, and adds possibleMonsters (enabled LocationMonster pool,
weight-descending, empty when hunting is disabled) to
WorldService.getCurrentLocation. Also updates the pre-existing
DB-less app.e2e-spec.ts to override HuntingModule the same way the other
feature modules already are, since it now needs a real DataSource.

apps/api/src/app.module.ts

@@ -2,6 +2,7 @@ import { Module } from '@nestjs/common';
 import { CharactersModule } from './characters/characters.module';
 import { DatabaseModule } from './database/database.module';
 import { HealthModule } from './health/health.module';
+import { HuntingModule } from './hunting/hunting.module';
 import { TravelModule } from './travel/travel.module';
 import { WorldModule } from './world/world.module';
 
@@ -12,6 +13,7 @@ import { WorldModule } from './world/world.module';
     CharactersModule,
     TravelModule,
     WorldModule,
+    HuntingModule,
   ],
 })
 export class AppModule {}