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>

lib/stripe.ts

@@ -0,0 +1,35 @@
+import { loadStripe, Stripe as StripeClient } from '@stripe/stripe-js'
+
+// Initialize Stripe on the client side
+let stripePromise: Promise<StripeClient | null>
+export const getStripe = () => {
+  if (!stripePromise) {
+    stripePromise = loadStripe(process.env.NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY!)
+  }
+  return stripePromise
+}
+
+// Donation amount presets (in USD)
+export const DONATION_PRESETS = [
+  { amount: 5, label: '$5' },
+  { amount: 10, label: '$10' },
+  { amount: 25, label: '$25' },
+  { amount: 50, label: '$50' },
+  { amount: 100, label: '$100' },
+  { amount: 250, label: '$250' },
+]
+
+// Helper function to format amount in cents to dollars
+export const formatAmount = (amountInCents: number, currency: string = 'usd'): string => {
+  const formatter = new Intl.NumberFormat('en-US', {
+    style: 'currency',
+    currency: currency.toUpperCase(),
+    minimumFractionDigits: 2,
+  })
+  return formatter.format(amountInCents / 100)
+}
+
+// Helper function to convert dollars to cents
+export const dollarsToCents = (dollars: number): number => {
+  return Math.round(dollars * 100)
+}