feat: add hunt/monster domain entities and pure danger-rating helper

Adds Task 1 of Playable Slice 0.2: pure entity/enum/helper definitions
for the Hunt/Encounter system (MonsterDefinition, LocationMonster,
Hunt, HuntEncounter, EncounterType, HuntStatus, RandomSource,
DangerRating). No DB migration, module wiring, or seed data yet.

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

apps/api/src/monsters/entities/encounter-type.enum.ts

@@ -0,0 +1,6 @@
+export enum EncounterType {
+  NORMAL = 'NORMAL',
+  RARE = 'RARE',
+  ELITE = 'ELITE',
+  BOSS = 'BOSS',
+}

apps/api/src/monsters/entities/location-monster.entity.ts

@@ -0,0 +1,45 @@
+import {
+  Column,
+  Entity,
+  JoinColumn,
+  ManyToOne,
+  PrimaryGeneratedColumn,
+} from 'typeorm';
+import { LocationDefinition } from '../../world/entities/location-definition.entity';
+import { EncounterType } from './encounter-type.enum';
+import { MonsterDefinition } from './monster-definition.entity';
+
+@Entity({ name: 'location_monsters' })
+export class LocationMonster {
+  @PrimaryGeneratedColumn('uuid', { name: 'id' })
+  id!: string;
+
+  @Column({ name: 'location_id', type: 'uuid' })
+  locationId!: string;
+
+  @Column({ name: 'monster_id', type: 'uuid' })
+  monsterId!: string;
+
+  @Column({ name: 'weight', type: 'integer' })
+  weight!: number;
+
+  @Column({
+    name: 'encounter_type',
+    type: 'enum',
+    enum: EncounterType,
+    enumName: 'location_monster_encounter_type_enum',
+    default: EncounterType.NORMAL,
+  })
+  encounterType!: EncounterType;
+
+  @Column({ name: 'enabled', type: 'boolean', default: true })
+  enabled!: boolean;
+
+  @ManyToOne(() => LocationDefinition, { onDelete: 'RESTRICT' })
+  @JoinColumn({ name: 'location_id' })
+  location!: LocationDefinition;
+
+  @ManyToOne(() => MonsterDefinition, { onDelete: 'RESTRICT' })
+  @JoinColumn({ name: 'monster_id' })
+  monster!: MonsterDefinition;
+}

apps/api/src/monsters/entities/monster-definition.entity.ts

@@ -0,0 +1,51 @@
+import {
+  Column,
+  CreateDateColumn,
+  Entity,
+  Index,
+  PrimaryGeneratedColumn,
+  UpdateDateColumn,
+} from 'typeorm';
+
+@Entity({ name: 'monster_definitions' })
+@Index('IDX_monster_definitions_key', ['key'], { unique: true })
+export class MonsterDefinition {
+  @PrimaryGeneratedColumn('uuid', { name: 'id' })
+  id!: string;
+
+  @Column({ name: 'key', type: 'varchar', length: 100 })
+  key!: string;
+
+  @Column({ name: 'name', type: 'varchar', length: 150 })
+  name!: string;
+
+  @Column({ name: 'level', type: 'integer' })
+  level!: number;
+
+  @Column({ name: 'max_hp', type: 'integer' })
+  maxHp!: number;
+
+  @Column({ name: 'attack', type: 'integer' })
+  attack!: number;
+
+  @Column({ name: 'armor', type: 'integer' })
+  armor!: number;
+
+  @Column({ name: 'experience_reward', type: 'integer' })
+  experienceReward!: number;
+
+  @Column({ name: 'silver_min', type: 'integer' })
+  silverMin!: number;
+
+  @Column({ name: 'silver_max', type: 'integer' })
+  silverMax!: number;
+
+  @Column({ name: 'artwork_path', type: 'varchar', length: 255 })
+  artworkPath!: string;
+
+  @CreateDateColumn({ name: 'created_at', type: 'timestamptz' })
+  createdAt!: Date;
+
+  @UpdateDateColumn({ name: 'updated_at', type: 'timestamptz' })
+  updatedAt!: Date;
+}