fix(monsters): finish deleting experienceReward, column included

Design ruling R7 abolishes XP as a concept and says the column goes with
it, but no task in the plan actually dropped it -- the plan only dropped
characters.experience and combat_rewards.experience_granted. Task 9
removed experienceReward from the seed literals, leaving
monster_definitions.experience_reward as a NOT NULL column with no
default that nothing supplies. The first monster insert against a real
database would have failed on a constraint violation.

No suite here could have caught it: none of them connect to Postgres.

Drops the column in the slice migration (which has never been run, so
amending it in place is correct rather than stacking a second one),
removes the entity field, and clears the three test fixtures that still
set it. silver_min/silver_max deliberately stay -- spec 15 keeps a
direct currency drop available as a lore-valid exception, and XP has no
such carve-out.

Also retargets the seed idempotency test off renown: 1, which is the
seed's own default and so could not distinguish "preserved" from
"reset to default".

NOTE ON SCOPE: this commit also absorbs a Prettier reformatting pass
that was already sitting uncommitted in the working tree, which is why
it touches ~59 files. That churn is purely cosmetic line-rewrapping --
verified by inspection, and the suite is green at 267/267 with the build
at exactly the 3 expected errors owned by Tasks 10 and 11. The repo is
not Prettier-clean at baseline (119 files still flagged), so this was a
partial run by an earlier step, not a deliberate repo-wide format.

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

apps/api/src/world/world.service.ts

@@ -2,10 +2,7 @@ import { Injectable, NotFoundException } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 import { Repository } from 'typeorm';
 import { Character } from '../characters/entities/character.entity';
-import {
-  calculateDangerRating,
-  DangerRating,
-} from '../hunting/danger-rating';
+import { calculateDangerRating, DangerRating } from '../hunting/danger-rating';
 import { LocationMonster } from '../monsters/entities/location-monster.entity';
 import { TravelService } from '../travel/travel.service';
 import { LocationConnection } from './entities/location-connection.entity';
@@ -107,9 +104,8 @@ export class WorldService {
       localArtworkPath: location.localArtworkPath,
       dangerRating: this.toLocalDangerRating(character, pool),
       recommendationLabel: this.toRecommendationLabel(location),
-      pointsOfInterest: location.localPointsOfInterest.map(
-        toPointOfInterestDto,
-      ),
+      pointsOfInterest:
+        location.localPointsOfInterest.map(toPointOfInterestDto),
       primaryActions: location.localPrimaryActions,
       encounterPreview: pool.map((entry) => ({
         key: entry.monster.key,