feat: audit Phase 1 — P0/P1 quick wins

- Fix vitalité: HP initial = 100 + (vitalité-1)×10
- Arme de départ: Bâton de Roseau équipé à la création
- Rebalance forge: niv3 200, niv4 400, niv5 700 (−30%)
- Confirmation avant vente d'item (confirm dialog)
- Fix forge costs dupliqués (shop sellback + inventaire)

frontend/src/pages/GuidePage.tsx

@@ -23,9 +23,9 @@ const RARITY_LABELS: Record<string, string> = {
 const FORGE_TABLE = [
   { level: 1, gold: 50,   endurance: 10, risk: '0%',  bonus: '+2' },
   { level: 2, gold: 100,  endurance: 10, risk: '0%',  bonus: '+4' },
-  { level: 3, gold: 250,  endurance: 10, risk: '20%', bonus: '+6' },
-  { level: 4, gold: 500,  endurance: 10, risk: '30%', bonus: '+8' },
-  { level: 5, gold: 1000, endurance: 10, risk: '40%', bonus: '+10' },
+  { level: 3, gold: 200,  endurance: 10, risk: '20%', bonus: '+6' },
+  { level: 4, gold: 400,  endurance: 10, risk: '30%', bonus: '+8' },
+  { level: 5, gold: 700,  endurance: 10, risk: '40%', bonus: '+10' },
 ];
 
 const TABS = [

frontend/src/pages/InventoryPage.tsx

@@ -16,7 +16,7 @@ function ItemCard({ ci, onEquip, onUnequip, onSell, selling }: {
   const forgeBonusDEF = item.type === 'armor' ? ci.forgeLevel * 2 : 0;
   const totalATK = item.attackBonus + forgeBonusATK;
   const totalDEF = item.defenseBonus + forgeBonusDEF;
-  const FORGE_COSTS: Record<number, number> = { 1: 50, 2: 100, 3: 250, 4: 500, 5: 1000 };
+  const FORGE_COSTS: Record<number, number> = { 1: 50, 2: 100, 3: 200, 4: 400, 5: 700 };
   let forgeInvestment = 0;
   for (let i = 1; i <= ci.forgeLevel; i++) forgeInvestment += FORGE_COSTS[i] ?? 0;
   const sellPrice = Math.floor(((item as any).buyPrice || 0) * 0.4 + forgeInvestment * 0.5);
@@ -125,7 +125,7 @@ export function InventoryPage() {
                 key={ci.id} ci={ci}
                 onEquip={() => equipMut.mutate(ci.id)}
                 onUnequip={() => unequipMut.mutate('weapon')}
-                onSell={() => sellMut.mutate(ci.id)}
+                onSell={() => { if (confirm(`Vendre ${ci.item.name} ?`)) sellMut.mutate(ci.id); }}
                 selling={sellMut.isPending}
               />
             ))}
@@ -145,7 +145,7 @@ export function InventoryPage() {
                 key={ci.id} ci={ci}
                 onEquip={() => equipMut.mutate(ci.id)}
                 onUnequip={() => unequipMut.mutate('armor')}
-                onSell={() => sellMut.mutate(ci.id)}
+                onSell={() => { if (confirm(`Vendre ${ci.item.name} ?`)) sellMut.mutate(ci.id); }}
                 selling={sellMut.isPending}
               />
             ))}

src/character/character.service.ts

@@ -11,6 +11,8 @@ import { LevelThreshold } from './entities/level-threshold.entity';
 import { CreateCharacterDto } from './dto/create-character.dto';
 import { DistributeStatsDto } from './dto/distribute-stats.dto';
 import { User } from '../user/user.entity';
+import { Item } from '../item/item.entity';
+import { CharacterItem } from '../item/character-item.entity';
 import { xpRequiredForLevel } from '../combat/combat.engine';
 
 const STAT_POOL = 10; // 5 stats × 1 base + 5 points à distribuer
@@ -53,6 +55,7 @@ export class CharacterService {
       throw new ConflictException('Ce joueur possède déjà un personnage');
     }
 
+    const baseHp = 100 + (dto.vitalite - 1) * 10; // vitalité 1 = 100 HP, chaque point = +10
     const character = this.characterRepository.create({
       userId: user.id,
       name: dto.name,
@@ -61,12 +64,29 @@ export class CharacterService {
       intelligence: dto.intelligence,
       chance: dto.chance,
       vitalite: dto.vitalite,
+      hpMax: baseHp,
+      hpCurrent: baseHp,
       enduranceSaved: 100,
       lastEnduranceTs: new Date(),
       enduranceMax: 100,
     });
 
     const saved = await this.characterRepository.save(character);
+
+    // Arme de départ — Bâton de Roseau équipé automatiquement
+    const starterWeapon = await this.dataSource.getRepository(Item)
+      .findOne({ where: { name: 'Bâton de Roseau' } });
+    if (starterWeapon) {
+      await this.dataSource.getRepository(CharacterItem).save(
+        this.dataSource.getRepository(CharacterItem).create({
+          characterId: saved.id,
+          itemId: starterWeapon.id,
+          forgeLevel: 0,
+          equipped: true,
+        }),
+      );
+    }
+
     return {
       ...saved,
       enduranceCurrent: this.calculateEndurance(saved),

src/forge/forge.service.ts

@@ -13,9 +13,9 @@ const FORGE_BONUS_PER_LEVEL = 2;
 const FORGE_GOLD_COST: Record<number, number> = {
   1: 50,
   2: 100,
-  3: 250,
-  4: 500,
-  5: 1000,
+  3: 200,
+  4: 400,
+  5: 700,
 };
 
 const FORGE_ENDURANCE_COST = 10;

src/shop/shop.service.ts

@@ -154,7 +154,7 @@ export class ShopService {
       if (charItem.equipped) throw new BadRequestException('Déséquipez l\'item avant de le vendre');
 
       // Prix de vente = base + investissement forge (coûts cumulés * 50%)
-      const FORGE_GOLD_COST: Record<number, number> = { 1: 50, 2: 100, 3: 250, 4: 500, 5: 1000 };
+      const FORGE_GOLD_COST: Record<number, number> = { 1: 50, 2: 100, 3: 200, 4: 400, 5: 700 };
       let forgeInvestment = 0;
       for (let i = 1; i <= charItem.forgeLevel; i++) {
         forgeInvestment += FORGE_GOLD_COST[i] ?? 0;