fix: revert schema url (not supported in Prisma 7) and copy config

Prisma 7 uses prisma.config.ts for datasource URL, not schema.prisma.
Revert the url addition and copy prisma.config.ts to production stage.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: VladUZH

apps/api/Dockerfile

@@ -61,6 +61,7 @@ COPY --from=build /app/packages/shared/dist ./packages/shared/dist
 COPY --from=build /app/packages/shared/package.json ./packages/shared/package.json
 COPY --from=build /app/apps/api/dist ./apps/api/dist
 COPY --from=build /app/apps/api/prisma ./apps/api/prisma
+COPY --from=build /app/apps/api/prisma.config.ts ./apps/api/prisma.config.ts
 COPY --from=build /app/apps/api/package.json ./apps/api/package.json
 COPY --from=build /app/package.json ./package.json
 

apps/api/prisma/schema.prisma

@@ -5,7 +5,6 @@ generator client {
 
 datasource db {
   provider = "postgresql"
-  url      = env("DATABASE_URL")
 }
 
 // ─── Tenant ──────────────────────────────────────────────────────────────────