fix(deploy): use dedicated dist-migrations dir and fix sed path in Dockerfile

Dockerfile

@@ -42,9 +42,10 @@ COPY . .
 RUN pnpm build
 
 # Transpile migrations to JS for production compatibility (ESM requires extensions)
-RUN npx tsc migrations/*.ts --outDir migrations --module esnext --target esnext --moduleResolution node --esModuleInterop --skipLibCheck || true && \
-    sed -i 's/from "\.\/\([^"]*\)";/from ".\/\1.js";/g' migrations/index.js && \
-    rm migrations/*.ts
+RUN mkdir -p dist-migrations && \
+    npx tsc migrations/*.ts --outDir dist-migrations --module esnext --target esnext --moduleResolution node --esModuleInterop --skipLibCheck || true && \
+    cp migrations/*.json dist-migrations/ 2>/dev/null || true && \
+    sed -i 's/from "\.\/\([^"]*\)";/from ".\/\1.js";/g' dist-migrations/index.js
 
 # Stage 2: Runner
 FROM node:20-alpine AS runner
@@ -67,8 +68,7 @@ ENV NEXT_TELEMETRY_DISABLED=1
 # Copy standalone output and static files
 COPY --from=builder --chown=nextjs:nodejs /app/public ./public
 COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
-COPY --from=builder --chown=nextjs:nodejs /app/migrations_built ./migrations
-COPY --from=builder --chown=nextjs:nodejs /app/migrations/*.json ./migrations/
+COPY --from=builder --chown=nextjs:nodejs /app/dist-migrations ./migrations
 COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
 COPY --from=builder --chown=nextjs:nodejs /app/.next/cache ./.next/cache