feat: landing page CRO revision, demo page, auto-trial, multi-catalog messaging

- Rewrite landing page copy with Jobs-to-be-Done and loss framing
- Add VIN live preview via backend pl24+emex decode chain
- Add comparison table (mobile-responsive), stats, pricing teaser, referral banner
- Replace testimonials with aggregate social proof stats
- Create demo page with 3-step VIN decode flow for unregistered users
- Add public /vehicles/preview/:vin endpoint (no auth required)
- Auto-create 7-day trial subscription on user registration
- Highlight multi-catalog cross-querying advantage in OEM feature and comparison
- Update register page with trial messaging and VIN param support

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

apps/api/src/auth/auth.ts

@@ -1,6 +1,7 @@
 import { betterAuth } from "better-auth";
 import { drizzleAdapter } from "better-auth/adapters/drizzle";
 import { drizzle } from "drizzle-orm/postgres-js";
+import { eq, asc } from "drizzle-orm";
 import postgres from "postgres";
 import * as schema from "../database/schema/core";
 
@@ -56,6 +57,40 @@ export function createAuth(databaseUrl: string, secret: string, baseUrl: string)
         },
       },
     },
+    databaseHooks: {
+      user: {
+        create: {
+          after: async (user) => {
+            try {
+              // Find the lowest-tier plan for trial
+              const [plan] = await db
+                .select()
+                .from(schema.plans)
+                .where(eq(schema.plans.isActive, true))
+                .orderBy(asc(schema.plans.priceMonthly))
+                .limit(1);
+
+              if (!plan) return;
+
+              const now = new Date();
+              const endDate = new Date(now);
+              endDate.setDate(endDate.getDate() + 7);
+
+              await db.insert(schema.userSubscriptions).values({
+                userId: user.id,
+                planId: plan.id,
+                status: "trial",
+                billingPeriod: "monthly",
+                startDate: now,
+                endDate,
+              });
+            } catch (err) {
+              console.error("Failed to create trial subscription:", err);
+            }
+          },
+        },
+      },
+    },
     trustedOrigins: [
       ...(process.env.CORS_ORIGIN || "http://localhost:3000").split(","),
       "http://localhost:4000",