docs: update Docker Compose setup documentation

[devin-ai-integration]

Docker Compose Documentation Update

This PR updates the Docker Compose setup documentation in docs/DEVELOPMENT.md and adds a Japanese translation in docs/DEVELOPMENT.ja.md.

Changes

• Updated environment variable references (.env.sample → .env.example)
• Added detailed service verification steps
• Added troubleshooting section
• Created Japanese documentation (DEVELOPMENT.ja.md)
• Removed outdated OpenAI references

Testing

• Verified Docker Compose setup works locally
• Confirmed all services start correctly:
  • Next.js on port 3000
  • Ollama on port 1143
  • PostgreSQL on port 5433
• Screenshot of working setup: https://gyazo.com/cc7685d4c5f3a693bf79250dd04c14a1

Documentation

• Added clear instructions for environment variables
• Added service verification steps
• Added troubleshooting guide for common issues
• Maintained language separation between English and Japanese docs

Link to Devin run: https://app.devin.ai/sessions/d246e1df9a664de88cc5dfe2f2f8a179

[devin-ai-integration]

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[yuiseki]

LGTM!