REFACTORED - migrate the data layer from Prisma to Drizzle (unify the stack)

- Add lib/db (Drizzle schema: 7 tables + 6 enums + relations, postgres.js client),
  drizzle.config.ts, lib/db/enums.ts (Prisma-compatible enum objects)
- Rewrite all 14 app consumers + 4 admin components to Drizzle
- Move the test DB layer to Drizzle + in-process PGlite; convert all 8 integration
  test files + factories (371 tests green)
- Remove Prisma: deps, prisma/ schema+migrations, lib/prisma.ts, Dockerfile prisma
  generate; wire db:generate/migrate/push/studio to drizzle-kit; update Makefile
- Preserve the old seed as scripts/legacy-prisma-seed.cjs (needs a Drizzle rewrite)

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