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>

app/api/stripe/checkout/route.ts

@@ -0,0 +1,99 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { stripe } from '@/lib/stripe-server'
+import { dollarsToCents } from '@/lib/stripe'
+import { prisma } from '@/lib/db'
+
+export async function POST(req: NextRequest) {
+  try {
+    const body = await req.json()
+    const { amount, email, name, message, isAnonymous, isRecurring, recurringInterval, locale } = body
+
+    // Validate required fields
+    if (!amount || !email) {
+      return NextResponse.json(
+        { error: 'Amount and email are required' },
+        { status: 400 }
+      )
+    }
+
+    // Convert amount to cents
+    const amountInCents = dollarsToCents(parseFloat(amount))
+
+    // Validate amount (minimum $1)
+    if (amountInCents < 100) {
+      return NextResponse.json(
+        { error: 'Minimum donation amount is $1' },
+        { status: 400 }
+      )
+    }
+
+    // Get the base URL for redirects
+    const baseUrl = process.env.NEXTAUTH_URL || 'http://localhost:3010'
+    const userLocale = locale || 'en'
+
+    // Create checkout session parameters
+    const sessionParams: any = {
+      payment_method_types: ['card'],
+      line_items: [
+        {
+          price_data: {
+            currency: 'usd',
+            product_data: {
+              name: 'Donation to Biblical Guide',
+              description: 'Support Biblical Guide - Every Scripture. Every Language. Forever Free.',
+              images: [`${baseUrl}/icon.png`],
+            },
+            unit_amount: amountInCents,
+          },
+          quantity: 1,
+        },
+      ],
+      mode: isRecurring ? 'subscription' : 'payment',
+      success_url: `${baseUrl}/${userLocale}/donate/success?session_id={CHECKOUT_SESSION_ID}`,
+      cancel_url: `${baseUrl}/${userLocale}/donate?canceled=true`,
+      customer_email: email,
+      metadata: {
+        donorName: name || 'Anonymous',
+        donorMessage: message || '',
+        isAnonymous: isAnonymous ? 'true' : 'false',
+      },
+    }
+
+    // Add recurring interval if applicable
+    if (isRecurring && recurringInterval) {
+      sessionParams.line_items[0].price_data.recurring = {
+        interval: recurringInterval,
+      }
+    }
+
+    // Create Stripe checkout session
+    const session = await stripe.checkout.sessions.create(sessionParams)
+
+    // Create donation record in database with PENDING status
+    await prisma.donation.create({
+      data: {
+        stripeSessionId: session.id,
+        email,
+        name: name || null,
+        amount: amountInCents,
+        currency: 'usd',
+        status: 'PENDING',
+        message: message || null,
+        isAnonymous: isAnonymous || false,
+        isRecurring: isRecurring || false,
+        recurringInterval: recurringInterval || null,
+        metadata: {
+          sessionUrl: session.url,
+        },
+      },
+    })
+
+    return NextResponse.json({ sessionId: session.id, url: session.url })
+  } catch (error) {
+    console.error('Error creating checkout session:', error)
+    return NextResponse.json(
+      { error: 'Failed to create checkout session' },
+      { status: 500 }
+    )
+  }
+}