feat(sprint5): quest system + arcs + rebalance endurance/damage/xp

Quest system:
  4 entities (quest_arcs, quests, player_quests, player_quest_arcs)
  Arc "Les Marais du Têtard" (4 quêtes narratives)
  3 quêtes standalone répétables (chasse/forge/craft)
  5 achievements liés (quests_completed + quest_arc_completed)
  Event-driven: combat/forge/craft/loot émettent quest.progress
  API: available, active, completed, accept, claim, arcs

Rebalance:
  Endurance coût combat 10→5, regen 6min→3min (20/h), repos 20→10
  Dégâts joueur +3 base (plus de combats de 13 tours au level 1)
  Défaite endurance penalty 50→25
  XP monstres réduite (25→8 Têtard, 130→50 Golem) — quêtes = source principale

src/database/quests-seed.ts

@@ -0,0 +1,176 @@
+import { DataSource } from 'typeorm';
+import { QuestArc } from '../quest/quest-arc.entity';
+import { Quest } from '../quest/quest.entity';
+import { Achievement } from '../achievement/achievement.entity';
+
+export async function seedQuests(dataSource: DataSource) {
+  const arcRepo = dataSource.getRepository(QuestArc);
+  const questRepo = dataSource.getRepository(Quest);
+  const achievementRepo = dataSource.getRepository(Achievement);
+
+  // --- Arc 1: Les Marais du Têtard ---
+  let arc = await arcRepo.findOne({ where: { name: 'Les Marais du Têtard' } });
+  if (!arc) {
+    arc = await arcRepo.save(arcRepo.create({
+      name: 'Les Marais du Têtard',
+      description: 'Les marais grouillent de créatures hostiles. Nettoyez la zone pour prouver votre valeur.',
+      zone: 'marais',
+      sortOrder: 1,
+      minLevel: 1,
+    }));
+  }
+
+  // Get monster IDs for targeted quests
+  const monsters = await dataSource.query('SELECT id, name FROM monsters');
+  const monsterMap = new Map<string, string>(monsters.map((m: any) => [m.name, m.id]));
+
+  const materials = await dataSource.query('SELECT id, name FROM materials');
+  const materialMap = new Map<string, string>(materials.map((m: any) => [m.name, m.id]));
+
+  const QUESTS = [
+    {
+      name: 'Premiers pas',
+      description: 'Éliminez 3 Têtards Vase pour sécuriser les abords du village.',
+      objectiveType: 'kill_monster',
+      objectiveTargetId: monsterMap.get('Têtard Vase') ?? null as string | null,
+      objectiveCount: 3,
+      rewardXp: 100,
+      rewardGold: 30,
+      rewardTitle: null,
+      arcId: arc.id,
+      arcOrder: 1,
+      minLevel: 1,
+      repeatable: false,
+    },
+    {
+      name: 'Chasseur de grenouilles',
+      description: 'Les Grenouilles Boueuses menacent les récoltes. Abattez-en 5.',
+      objectiveType: 'kill_monster',
+      objectiveTargetId: monsterMap.get('Grenouille Boueuse') ?? null as string | null,
+      objectiveCount: 5,
+      rewardXp: 200,
+      rewardGold: 60,
+      rewardTitle: null,
+      arcId: arc.id,
+      arcOrder: 2,
+      minLevel: 2,
+      repeatable: false,
+    },
+    {
+      name: 'Apprenti combattant',
+      description: 'Prouvez votre endurance en remportant 10 combats.',
+      objectiveType: 'kill_any',
+      objectiveTargetId: null,
+      objectiveCount: 10,
+      rewardXp: 150,
+      rewardGold: 50,
+      rewardTitle: null,
+      arcId: arc.id,
+      arcOrder: 3,
+      minLevel: 1,
+      repeatable: false,
+    },
+    {
+      name: 'Le gardien des marais',
+      description: 'Le Golem de Boue terrorise les marais depuis trop longtemps. Mettez fin à son règne.',
+      objectiveType: 'kill_monster',
+      objectiveTargetId: monsterMap.get('Golem de Boue') ?? null as string | null,
+      objectiveCount: 1,
+      rewardXp: 500,
+      rewardGold: 200,
+      rewardTitle: 'Nettoyeur des Marais',
+      arcId: arc.id,
+      arcOrder: 4,
+      minLevel: 5,
+      repeatable: false,
+    },
+  ];
+
+  // Standalone repeatable quests (daily feel)
+  const STANDALONE = [
+    {
+      name: 'Chasse du jour',
+      description: 'Remportez 5 combats.',
+      objectiveType: 'kill_any',
+      objectiveTargetId: null,
+      objectiveCount: 5,
+      rewardXp: 80,
+      rewardGold: 25,
+      rewardTitle: null,
+      arcId: null,
+      arcOrder: 0,
+      minLevel: 1,
+      repeatable: true,
+    },
+    {
+      name: 'Apprenti forgeron',
+      description: 'Améliorez un item à la forge.',
+      objectiveType: 'forge_item',
+      objectiveTargetId: null,
+      objectiveCount: 1,
+      rewardXp: 60,
+      rewardGold: 20,
+      rewardTitle: null,
+      arcId: null,
+      arcOrder: 0,
+      minLevel: 1,
+      repeatable: true,
+    },
+    {
+      name: 'Artisan du jour',
+      description: 'Complétez un craft.',
+      objectiveType: 'craft_item',
+      objectiveTargetId: null,
+      objectiveCount: 1,
+      rewardXp: 50,
+      rewardGold: 15,
+      rewardTitle: null,
+      arcId: null,
+      arcOrder: 0,
+      minLevel: 1,
+      repeatable: true,
+    },
+  ];
+
+  for (const data of [...QUESTS, ...STANDALONE]) {
+    const existing = await questRepo.findOne({ where: { name: data.name } });
+    if (!existing) {
+      await questRepo.save(questRepo.create(data));
+    }
+  }
+
+  // --- Quest achievements ---
+  const QUEST_ACHIEVEMENTS = [
+    { key: 'quests_5', name: 'Aventurier Curieux', description: 'Compléter 5 quêtes', category: 'progression', tier: 'bronze', criteriaType: 'quests_completed', criteriaValue: 5, rewardGold: 100, rewardTitle: null },
+    { key: 'quests_25', name: 'Héros du Peuple', description: 'Compléter 25 quêtes', category: 'progression', tier: 'silver', criteriaType: 'quests_completed', criteriaValue: 25, rewardGold: 500, rewardTitle: 'Héros du Peuple' },
+    { key: 'quests_100', name: 'Légende Quêteuse', description: 'Compléter 100 quêtes', category: 'progression', tier: 'gold', criteriaType: 'quests_completed', criteriaValue: 100, rewardGold: 2000, rewardTitle: 'Légende Quêteuse' },
+    { key: 'arc_1', name: 'Premier Arc', description: 'Compléter un arc narratif', category: 'progression', tier: 'bronze', criteriaType: 'quest_arc_completed', criteriaValue: 1, rewardGold: 300, rewardTitle: null },
+    { key: 'arc_3', name: 'Conteur', description: 'Compléter 3 arcs narratifs', category: 'progression', tier: 'silver', criteriaType: 'quest_arc_completed', criteriaValue: 3, rewardGold: 1000, rewardTitle: 'Conteur' },
+  ];
+
+  for (const data of QUEST_ACHIEVEMENTS) {
+    const existing = await achievementRepo.findOne({ where: { key: data.key } });
+    if (!existing) {
+      await achievementRepo.save(achievementRepo.create(data));
+    }
+  }
+
+  console.log(`✅ 1 arc + ${QUESTS.length + STANDALONE.length} quêtes + ${QUEST_ACHIEVEMENTS.length} achievements seedés`);
+}
+
+// Update monster XP rewards (nerf for quest-driven progression)
+export async function nerfMonsterXp(dataSource: DataSource) {
+  const updates = [
+    { name: 'Têtard Vase', xpReward: 8 },
+    { name: 'Grenouille Boueuse', xpReward: 15 },
+    { name: 'Serpent des Marais', xpReward: 25 },
+    { name: 'Champi Vénéneux', xpReward: 20 },
+    { name: 'Golem de Boue', xpReward: 50 },
+  ];
+
+  for (const u of updates) {
+    await dataSource.query('UPDATE monsters SET xp_reward = ? WHERE name = ?', [u.xpReward, u.name]);
+  }
+
+  console.log('✅ XP monstres ajustée (nerf pour progression par quêtes)');
+}