Fix Docker production build: move tsx to dependencies, reinstall in production stage

The production Docker stage was copying pnpm symlinks between stages
which broke module resolution. Now does a fresh pnpm install --prod
in the production stage and runs from the server working directory.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/server/Dockerfile

@@ -18,12 +18,12 @@ RUN pnpm --filter @ai-tycoon/shared build && \
     pnpm --filter @ai-tycoon/server typecheck
 
 FROM base AS production
-COPY --from=deps /app/node_modules ./node_modules
-COPY --from=deps /app/packages/shared/node_modules ./packages/shared/node_modules
-COPY --from=deps /app/apps/server/node_modules ./apps/server/node_modules
+COPY pnpm-lock.yaml pnpm-workspace.yaml package.json ./
 COPY packages/shared ./packages/shared
 COPY packages/tsconfig ./packages/tsconfig
 COPY apps/server ./apps/server
+RUN pnpm install --frozen-lockfile --prod
 ENV NODE_ENV=production
 EXPOSE 3001
-CMD ["node", "--import", "tsx", "apps/server/src/index.ts"]
+WORKDIR /app/apps/server
+CMD ["node", "--import", "tsx", "src/index.ts"]

apps/server/package.json

@@ -19,13 +19,13 @@
     "drizzle-orm": "^0.44.2",
     "hono": "^4.7.10",
     "postgres": "^3.4.7",
+    "tsx": "^4.19.4",
     "uuid": "^11.1.0"
   },
   "devDependencies": {
     "@ai-tycoon/tsconfig": "workspace:*",
     "@types/node": "^25.6.0",
     "drizzle-kit": "^0.31.1",
-    "tsx": "^4.19.4",
     "typescript": "^5.8.3"
   }
 }