feat: implement form submission system with Drizzle ORM and admin dashboard

app/api/auth/[...nextauth]/route.ts

@@ -0,0 +1,41 @@
+import NextAuth, { type NextAuthOptions } from "next-auth";
+import DiscordProvider from "next-auth/providers/discord";
+import { DrizzleAdapter } from "@auth/drizzle-adapter";
+import { db } from "@/db";
+import { accounts, sessions, users, verificationTokens } from "@/db/schema";
+
+export const authOptions: NextAuthOptions = {
+  adapter: DrizzleAdapter(db, {
+    usersTable: users,
+    accountsTable: accounts,
+    sessionsTable: sessions,
+    verificationTokensTable: verificationTokens,
+  }),
+  providers: [
+    DiscordProvider({
+      clientId: process.env.DISCORD_CLIENT_ID!,
+      clientSecret: process.env.DISCORD_CLIENT_SECRET!,
+    }),
+  ],
+  callbacks: {
+    async session({ session, user }) {
+      if (session.user) {
+        (session.user as any).id = user.id;
+        // Attach discordId from accounts table
+        const acct = await db.query.accounts.findFirst({
+          where: (a, { eq, and }) =>
+            and(eq(a.userId, user.id), eq(a.provider, "discord")),
+        });
+        if (acct) {
+          (session.user as typeof session.user & { discordId: string }).discordId =
+            acct.providerAccountId;
+        }
+      }
+      return session;
+    },
+  },
+  secret: process.env.NEXTAUTH_SECRET,
+};
+
+const handler = NextAuth(authOptions);
+export { handler as GET, handler as POST };