feat: add hunt API client and models for Playable Slice 0.2

Add to game-api.models.ts:
- DangerRating type for hunt encounter danger levels
- MonsterSummary interface with key, name, level, artworkPath
- HuntEncounter interface for individual hunt encounters
- HuntResult interface for hunt completion results, reusing LocationSummary

Extend CurrentLocationResponse with possibleMonsters: string[] field.

Add to game-api.service.ts:
- startHunt(): Observable<HuntResult> method posting to /api/hunts

Update test fixtures to include possibleMonsters field in mock locations.

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

apps/web/src/app/features/world/world-page.component.spec.ts

@@ -32,6 +32,7 @@ const southGate: CurrentLocationResponse = {
   huntingEnabled: false,
   artworkPath: '/images/backgrounds/Suedtor.png',
   connections: [burnedRoadConnection],
+  possibleMonsters: [],
 };
 
 const burnedRoad: CurrentLocationResponse = {
@@ -43,6 +44,7 @@ const burnedRoad: CurrentLocationResponse = {
   isSafe: false,
   huntingEnabled: true,
   artworkPath: '/images/backgrounds/Aschestrasse.png',
+  possibleMonsters: ['goblin', 'skeleton'],
   connections: [
     {
       targetLocation: { id: 'south-gate-id', key: 'south-gate', name: 'Südtor von Graufurt' },

apps/web/src/app/features/world/world.store.spec.ts

@@ -33,6 +33,7 @@ const currentLocation: CurrentLocationResponse = {
   isSafe: true,
   huntingEnabled: false,
   artworkPath: '/images/backgrounds/Suedtor.png',
+  possibleMonsters: [],
   connections: [
     {
       targetLocation: {