refacto: constants.ts — source unique frontend

- Centralise RARITY_COLORS, RARITY_LABELS, ZONE_INFO, STAT_LABELS
- Centralise COMBAT_COST, REST_COST, FORGE_*, ATTACK_TYPES
- Supprime 6 duplications dans CombatPage, GuidePage, ShopPage, ForgePage, InventoryPage

frontend/src/pages/CombatPage.tsx

@@ -5,14 +5,7 @@ import { combatApi, characterApi } from '../api/endpoints';
 import type { Monster, CombatResult, MultiCombatResult, CombatLog } from '../api/types';
 import { Swords, Trophy, Skull, Clock, Zap, Heart, Lock } from 'lucide-react';
 
-const COMBAT_COST = 5;
-const REST_COST = 10;
-
-const ATTACK_TYPES = [
-  { id: 'melee',  label: 'Mêlée',    emoji: '⚔️',  stat: 'Force × 1.5' },
-  { id: 'ranged', label: 'Distance', emoji: '🏹',  stat: 'Agilité × 1.5' },
-  { id: 'magic',  label: 'Magie',    emoji: '✨',  stat: 'Intelligence × 1.5' },
-];
+import { COMBAT_COST, REST_COST, ATTACK_TYPES, ZONE_INFO } from '../constants';
 
 function MonsterCard({ m, selected, onSelect, playerLevel }: { m: Monster; selected: boolean; onSelect: () => void; playerLevel: number }) {
   const tooHard = m.minLevel > playerLevel + 2;
@@ -211,11 +204,7 @@ export function CombatPage() {
     monstersByZone.set(zone, list);
   }
 
-  const ZONE_LABELS: Record<string, { name: string; emoji: string }> = {
-    marais: { name: 'Les Marais', emoji: '🌿' },
-    egouts: { name: 'Les Égouts', emoji: '🕳️' },
-    desert: { name: 'Le Désert', emoji: '🏜️' },
-  };
+  const ZONE_LABELS = ZONE_INFO;
 
   // Locked zones (zones not in monsters response = locked)
   const lockedZones = (zones ?? []).filter((z: any) => !z.unlocked);