REFACTORED - Replace Prisma with Drizzle ORM

- Add lib/db (schema, postgres.js client, enums, seed, migrations) on Drizzle
- Rewrite all lib and admin action queries from Prisma to Drizzle
- Keep existing table/column names so no data migration is needed
- Preserve signed-cookie admin auth unchanged
- Map unique-violation handling from Prisma P2002 to SQLSTATE 23505
- Swap deps, scripts, Makefile, and Dockerfile from Prisma to Drizzle

app/api/health/route.ts

@@ -1,6 +1,7 @@
+import { sql } from "drizzle-orm";
 import { NextResponse } from "next/server";
 
-import { prisma } from "@/lib/prisma";
+import { db } from "@/lib/db";
 
 export const dynamic = "force-dynamic";
 
@@ -8,7 +9,7 @@ export async function GET() {
   const timestamp = new Date().toISOString();
 
   try {
-    await prisma.$queryRaw`SELECT 1`;
+    await db.execute(sql`SELECT 1`);
 
     return NextResponse.json(
       {