The base devcontainer image was unnecessarily large, causing codespace setup times of over 5 minutes. This PR optimizes the devcontainer configuration to significantly reduce image size and setup time.

Changes Made

• Base image: Changed from mcr.microsoft.com/vscode/devcontainers/python:3.13 (~2GB+) to python:3.13-slim (~200MB)
• Removed unnecessary features:
  • Node.js feature (not needed for this FastAPI application)
  • Docker-in-Docker feature (not required)
  • ESLint VS Code extension (no longer applicable without Node.js)
• Kept essential components:
  • Python development environment
  • GitHub Copilot extensions
  • Python debugging support
  • MCP chat settings

Benefits

• Faster setup: Expected reduction from 5+ minutes to under 1 minute
• Smaller footprint: ~90% reduction in image size
• Same functionality: All application features remain intact

Testing

Verified that the application works correctly with the optimized configuration:

• ✅ FastAPI server starts successfully
• ✅ API endpoints respond correctly
• ✅ Static file serving works
• ✅ All existing functionality preserved

The optimized devcontainer maintains all necessary development capabilities while dramatically improving the developer experience through faster setup times.

Fixes #38.

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