Referral page, bug fixes, seed data, persona tiers

- New /refer page with share/copy/stats
- Fixed modal z-index conflicts (z-50 → z-[60]) across forum, groups, souq, halal-monitor
- Seed route: forum categories, marketplace listings, private groups
- Mufti/Daie personas now available in Premium tier
- Fixed referral share link: falahos.my/mobile/auth?ref=CODE
- Fixed client-side persona access check for premium

src/app/api/chat/send/route.ts

@@ -108,8 +108,8 @@ export async function POST(request: Request) {
       }
     }
 
-    // Generate AI response
-    const aiContent = generateAIReply(personaId, lastUserMessage, historyContext);
+    // Generate AI response (tries LLM first, falls back to keyword rules)
+    const aiContent = await generateAIReply(personaId, lastUserMessage, historyContext);
 
     // Save AI response to ChatHistory
     const aiMessage = await prisma.chatHistory.create({