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/lib/ai/tools/slides.tool.ts

@@ -81,8 +81,8 @@ RULES:
 
           console.log('[Slides Tool] Canvas created:', canvas.id, '| Slides:', slides.length, '| Size:', Math.round(html.length / 1024), 'KB')
 
-          // Decrement reformulate quota (agent-based generation consumes credits)
-          incrementUsageAsync(ctx.userId, 'reformulate')
+          // Decrement slide_generate quota after successful canvas creation
+          incrementUsageAsync(ctx.userId, 'slide_generate')
 
           if (ctx.actionId) {
             await prisma.agentAction.update({