feat: implement AI chat with vector search and random loading messages

Major Features:
- ✅ AI chat with Azure OpenAI GPT-4o integration
- ✅ Vector search across Bible versions (ASV English, RVA 1909 Spanish)
- ✅ Multi-language support with automatic English fallback
- ✅ Bible version citations in responses [ASV] [RVA 1909]
- ✅ Random Bible-themed loading messages (5 variants)
- ✅ Safe build script with memory guardrails
- ✅ 8GB swap memory for build safety
- ✅ Stripe donation integration (multiple payment methods)

AI Chat Improvements:
- Implement vector search with 1536-dim embeddings (Azure text-embedding-ada-002)
- Search all Bible versions in user's language, fallback to English
- Cite Bible versions properly in AI responses
- Add 5 random loading messages: "Searching the Scriptures...", etc.
- Fix Ollama conflict (disabled to use Azure OpenAI exclusively)
- Optimize hybrid search queries for actual table schema

Build & Infrastructure:
- Create safe-build.sh script with memory monitoring (prevents server crashes)
- Add 8GB swap memory for emergency relief
- Document build process in BUILD_GUIDE.md
- Set Node.js memory limits (4GB max during builds)

Database:
- Clean up 115 old vector tables with wrong dimensions
- Keep only 2 tables with correct 1536-dim embeddings
- Add Stripe schema for donations and subscriptions

Documentation:
- AI_CHAT_FINAL_STATUS.md - Complete implementation status
- AI_CHAT_IMPLEMENTATION_COMPLETE.md - Technical details
- BUILD_GUIDE.md - Safe building guide with guardrails
- CHAT_LOADING_MESSAGES.md - Loading messages implementation
- STRIPE_IMPLEMENTATION_COMPLETE.md - Stripe integration docs
- STRIPE_SETUP_GUIDE.md - Stripe configuration guide

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

prisma/schema.prisma

@@ -37,6 +37,7 @@ model User {
   createdSocialMedia SocialMediaLink[] @relation("SocialMediaCreator")
   updatedSocialMedia SocialMediaLink[] @relation("SocialMediaUpdater")
   updatedMailgunSettings MailgunSettings[] @relation("MailgunSettingsUpdater")
+  donations          Donation[]
 
   @@index([role])
 }
@@ -420,3 +421,37 @@ model MailgunSettings {
 
   @@index([isEnabled])
 }
+
+model Donation {
+  id                String   @id @default(uuid())
+  userId            String?  // Optional - can be anonymous
+  stripeSessionId   String   @unique
+  stripePaymentId   String?  // Payment intent ID
+  email             String
+  name              String?
+  amount            Int      // Amount in cents
+  currency          String   @default("usd")
+  status            DonationStatus @default(PENDING)
+  message           String?  @db.Text // Optional message from donor
+  isAnonymous       Boolean  @default(false)
+  isRecurring       Boolean  @default(false)
+  recurringInterval String?  // monthly, yearly
+  metadata          Json?    // Store additional Stripe metadata
+  createdAt         DateTime @default(now())
+  updatedAt         DateTime @updatedAt
+
+  user              User?    @relation(fields: [userId], references: [id], onDelete: SetNull)
+
+  @@index([userId])
+  @@index([status])
+  @@index([createdAt])
+  @@index([email])
+}
+
+enum DonationStatus {
+  PENDING
+  COMPLETED
+  FAILED
+  REFUNDED
+  CANCELLED
+}