feat: seed Aschenratte and Straßenräuber for Verbrannte Straße

Adds the two starter monster definitions and their location-monster
mapping (weights 70/30) to the vertical-slice seed, following the
same findOneBy/update-or-insert pattern used for locations, plus an
upsert on (locationId, monsterId) for the mapping. Copies the source
artwork into the served images/monsters directory and extends the
seed spec harness to cover both idempotent inserts.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

apps/api/src/database/seeds/vertical-slice.seed.spec.ts

@@ -1,5 +1,7 @@
 import { DataSource } from 'typeorm';
 import { Character } from '../../characters/entities/character.entity';
+import { LocationMonster } from '../../monsters/entities/location-monster.entity';
+import { MonsterDefinition } from '../../monsters/entities/monster-definition.entity';
 import { LocationConnection } from '../../world/entities/location-connection.entity';
 import { LocationDefinition } from '../../world/entities/location-definition.entity';
 import { seedVisibleVerticalSlice } from './vertical-slice.seed';
@@ -9,6 +11,8 @@ type Row = Record<string, unknown>;
 const DEMO_CHARACTER_ID = '10000000-0000-4000-8000-000000000001';
 const SOUTH_GATE_ID = '20000000-0000-4000-8000-000000000001';
 const BURNED_ROAD_ID = '20000000-0000-4000-8000-000000000002';
+const ASH_RAT_MONSTER_ID = '30000000-0000-4000-8000-000000000001';
+const ROAD_BANDIT_MONSTER_ID = '30000000-0000-4000-8000-000000000002';
 
 class InMemoryRepository {
   readonly rows: Row[] = [];
@@ -61,6 +65,8 @@ function createDataSource(
   locationRepository: InMemoryRepository,
   connectionRepository: InMemoryRepository,
   characterRepository: InMemoryRepository,
+  monsterRepository: InMemoryRepository,
+  locationMonsterRepository: InMemoryRepository,
 ): DataSource {
   return {
     getRepository: jest.fn((entity: unknown) => {
@@ -73,6 +79,12 @@ function createDataSource(
       if (entity === Character) {
         return characterRepository;
       }
+      if (entity === MonsterDefinition) {
+        return monsterRepository;
+      }
+      if (entity === LocationMonster) {
+        return locationMonsterRepository;
+      }
 
       throw new Error('Unexpected repository');
     }),
@@ -84,10 +96,14 @@ describe('seedVisibleVerticalSlice', () => {
     const locationRepository = new InMemoryRepository();
     const connectionRepository = new InMemoryRepository();
     const characterRepository = new InMemoryRepository();
+    const monsterRepository = new InMemoryRepository();
+    const locationMonsterRepository = new InMemoryRepository();
     const dataSource = createDataSource(
       locationRepository,
       connectionRepository,
       characterRepository,
+      monsterRepository,
+      locationMonsterRepository,
     );
 
     await seedVisibleVerticalSlice(dataSource);
@@ -136,13 +152,63 @@ describe('seedVisibleVerticalSlice', () => {
         experience: 39,
       }),
     );
+
+    expect(monsterRepository.insert).toHaveBeenCalledTimes(2);
+    expect(monsterRepository.rows).toHaveLength(2);
+    expect(monsterRepository.rows).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({
+          key: 'ash-rat',
+          name: 'Aschenratte',
+          level: 1,
+          maxHp: 45,
+          attack: 5,
+          armor: 0,
+          experienceReward: 8,
+          silverMin: 4,
+          silverMax: 7,
+          artworkPath: '/images/monsters/ash-rat.png',
+        }),
+        expect.objectContaining({
+          key: 'road-bandit',
+          name: 'Straßenräuber',
+          level: 2,
+          maxHp: 75,
+          attack: 9,
+          armor: 5,
+          experienceReward: 16,
+          silverMin: 9,
+          silverMax: 15,
+          artworkPath: '/images/monsters/road-bandit.png',
+        }),
+      ]),
+    );
+
+    expect(locationMonsterRepository.upsert).toHaveBeenCalledWith(
+      expect.arrayContaining([
+        expect.objectContaining({
+          locationId: BURNED_ROAD_ID,
+          monsterId: ASH_RAT_MONSTER_ID,
+          weight: 70,
+        }),
+        expect.objectContaining({
+          locationId: BURNED_ROAD_ID,
+          monsterId: ROAD_BANDIT_MONSTER_ID,
+          weight: 30,
+        }),
+      ]),
+      ['locationId', 'monsterId'],
+    );
+    expect(locationMonsterRepository.rows).toHaveLength(2);
   });
 
   it('preserves existing location IDs and uses them for the directed connections', async () => {
     const locationRepository = new InMemoryRepository();
     const connectionRepository = new InMemoryRepository();
     const characterRepository = new InMemoryRepository();
-    const persistedSouthGateId = '30000000-0000-4000-8000-000000000001';
+    const monsterRepository = new InMemoryRepository();
+    const locationMonsterRepository = new InMemoryRepository();
+    const persistedSouthGateId = '40000000-0000-4000-8000-000000000001';
     locationRepository.rows.push({
       id: persistedSouthGateId,
       key: 'south-gate',
@@ -152,6 +218,8 @@ describe('seedVisibleVerticalSlice', () => {
       locationRepository,
       connectionRepository,
       characterRepository,
+      monsterRepository,
+      locationMonsterRepository,
     );
 
     await seedVisibleVerticalSlice(dataSource);