fix(docker): prisma generate must run before packages/db tsc build

packages/db/src/index.ts re-exports model types from @prisma/client,
so the generated client has to exist before tsc walks that file. The
previous order hit TS2305 on User/Manufacturer/Site/etc.

apps/api/Dockerfile

@@ -19,9 +19,9 @@ RUN pnpm install --frozen-lockfile
 
 COPY . .
 
-RUN pnpm -C packages/shared build \
+RUN pnpm -C packages/db     exec prisma generate \
+ && pnpm -C packages/shared build \
  && pnpm -C packages/db     build \
- && pnpm -C packages/db     exec prisma generate \
  && pnpm -C apps/api        build
 
 # Point workspace package.json "main/exports" at compiled JS so Node