feat: add server modules (stripe, contract, ai, facebook)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/server/stripe.ts

@@ -0,0 +1,94 @@
+import Stripe from 'stripe';
+
+function getStripe(): Stripe | null {
+	if (!process.env.STRIPE_SECRET_KEY) return null;
+	return new Stripe(process.env.STRIPE_SECRET_KEY);
+}
+
+export async function createDonationCheckout(params: {
+	amount: number;
+	donorEmail?: string;
+	petId?: number;
+	petName?: string;
+	successUrl: string;
+	cancelUrl: string;
+}): Promise<string | null> {
+	const stripe = getStripe();
+	if (!stripe) return null;
+
+	const session = await stripe.checkout.sessions.create({
+		payment_method_types: ['card'],
+		mode: 'payment',
+		customer_email: params.donorEmail,
+		line_items: [{
+			price_data: {
+				currency: 'usd',
+				product_data: {
+					name: params.petName
+						? `Donation for ${params.petName}`
+						: 'Donation'
+				},
+				unit_amount: params.amount
+			},
+			quantity: 1
+		}],
+		metadata: {
+			type: 'donation',
+			petId: params.petId?.toString() || ''
+		},
+		success_url: params.successUrl,
+		cancel_url: params.cancelUrl
+	});
+
+	return session.url;
+}
+
+export async function createAdoptionFeeCheckout(params: {
+	amount: number;
+	petId: number;
+	petName: string;
+	adopterEmail: string;
+	successUrl: string;
+	cancelUrl: string;
+}): Promise<string | null> {
+	const stripe = getStripe();
+	if (!stripe) return null;
+
+	const session = await stripe.checkout.sessions.create({
+		payment_method_types: ['card'],
+		mode: 'payment',
+		customer_email: params.adopterEmail,
+		line_items: [{
+			price_data: {
+				currency: 'usd',
+				product_data: {
+					name: `Adoption Fee — ${params.petName}`
+				},
+				unit_amount: params.amount
+			},
+			quantity: 1
+		}],
+		metadata: {
+			type: 'adoption_fee',
+			petId: params.petId.toString()
+		},
+		success_url: params.successUrl,
+		cancel_url: params.cancelUrl
+	});
+
+	return session.url;
+}
+
+export function constructWebhookEvent(
+	body: string,
+	signature: string
+): Stripe.Event | null {
+	const stripe = getStripe();
+	if (!stripe || !process.env.STRIPE_WEBHOOK_SECRET) return null;
+
+	return stripe.webhooks.constructEvent(
+		body,
+		signature,
+		process.env.STRIPE_WEBHOOK_SECRET
+	);
+}