feat(combat): add HTTP controllers for starting, reading, and acting on combats

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/api/src/combat/hunt-encounter-attack.controller.ts

@@ -0,0 +1,13 @@
+import { Controller, Param, Post } from '@nestjs/common';
+import { DEMO_CHARACTER_ID } from '../demo/demo-character.constants';
+import { CombatService } from './combat.service';
+
+@Controller('hunt-encounters')
+export class HuntEncounterAttackController {
+  constructor(private readonly combatService: CombatService) {}
+
+  @Post(':encounterId/attack')
+  attack(@Param('encounterId') encounterId: string) {
+    return this.combatService.startCombat(DEMO_CHARACTER_ID, encounterId);
+  }
+}