fix: resolve Docker build failure by optimizing configuration and prisma signal handling

- Added .dockerignore to prevent build poisoning from local artifacts.
- Updated Dockerfile with stable Bun version, memory limits, and missing config files.
- Refined prisma.ts signal handlers to avoid process termination during Next.js build phases.
- Synchronized eslint-config-next with Next.js version.

package.json

@@ -120,7 +120,7 @@
     "@types/react-dom": "^19",
     "@vitest/ui": "^4.0.18",
     "eslint": "^9",
-    "eslint-config-next": "15.1.6",
+    "eslint-config-next": "15.5.12",
     "jsdom": "^28.0.0",
     "msw": "^2.12.9",
     "parcel": "^2.6.2",