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

Dockerfile

@@ -7,7 +7,7 @@ FROM node:22-alpine AS builder
 WORKDIR /app
 COPY --from=deps /app/node_modules ./node_modules
 COPY . .
-RUN npx prisma generate && npm run build
+RUN npm run build
 
 FROM node:22-alpine AS runner
 WORKDIR /app
@@ -17,8 +17,8 @@ COPY --from=builder /app/package*.json ./
 COPY --from=builder /app/node_modules ./node_modules
 COPY --from=builder /app/.next ./.next
 COPY --from=builder /app/public ./public
-COPY --from=builder /app/prisma ./prisma
-COPY --from=builder /app/prisma.config.ts ./prisma.config.ts
+COPY --from=builder /app/drizzle.config.ts ./drizzle.config.ts
+COPY --from=builder /app/lib/db ./lib/db
 COPY --from=builder /app/next.config.mjs ./next.config.mjs
 
 EXPOSE 3000