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

drizzle.config.ts

@@ -0,0 +1,13 @@
+import type { Config } from "drizzle-kit";
+
+const rawConnectionString =
+  process.env.DATABASE_URL ?? "postgresql://postgres:postgres@localhost:5432/moh_sass";
+
+export default {
+  schema: "./lib/db/schema.ts",
+  out: "./lib/db/migrations",
+  dialect: "postgresql",
+  dbCredentials: {
+    url: rawConnectionString.split("?")[0],
+  },
+} satisfies Config;