Add Better Auth admin authentication

convex/schema.ts

@@ -1,5 +1,6 @@
 import { defineSchema, defineTable } from "convex/server";
 import { v } from "convex/values";
+import { tables as authTables } from "./betterAuth/schema";
 
 const campaignStatus = v.union(v.literal("active"), v.literal("paused"));
 const leadPriority = v.union(
@@ -114,6 +115,7 @@ const eventDetail = v.object({
 });
 
 export default defineSchema({
+  ...authTables,
   campaigns: defineTable({
     name: v.string(),
     categoryMode: v.union(v.literal("preset"), v.literal("custom")),