fix: quota slide_generate pour tier BASIC

- Ajoute slide_generate et excalidraw_generate dans TIER_LIMITS
  (BASIC: 3, PRO: 20, BUSINESS: 100, ENTERPRISE: unlimited)
- run-for-note: utilise le bon feature key selon le type d'agent
- slides.tool: incrémente slide_generate (pas reformulate)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

memento-note/app/api/agents/run-for-note/route.ts

@@ -44,9 +44,10 @@ export async function POST(req: NextRequest) {
     return NextResponse.json({ error: 'Paramètres invalides' }, { status: 400 })
   }
 
-  // Quota check — slides/excalidraw generation counts as 'reformulate' credit
+  // Quota check — feature key depends on generation type
+  const featureKey = type === 'slide-generator' ? 'slide_generate' : 'excalidraw_generate'
   try {
-    await checkEntitlementOrThrow(userId, 'reformulate')
+    await checkEntitlementOrThrow(userId, featureKey)
   } catch (e) {
     if (e instanceof QuotaExceededError) {
       return NextResponse.json({ error: e.message }, { status: 402 })