Greptile Summary

This PR makes significant architectural changes to move away from FastAPI to using Starlette directly, which is the underlying web framework that FastAPI is built upon. The changes include:

1. Moving FastAPI import to dev dependencies and adding Starlette as a main dependency
2. Cleaning up FastAPI-related code in the core application
3. Fixing a safety issue with __init__.py file deletion behavior
4. Reorganizing and updating dependency management in pyproject.toml

This is a well-structured change that simplifies the codebase by removing an unnecessary layer (FastAPI) while maintaining the core functionality through Starlette. The changes are particularly focused on making the framework more efficient and safer.

Confidence score: 4 /5

1. This PR is generally safe to merge but requires careful testing of HTTP endpoints
2. The score reflects high confidence in the technical approach while acknowledging the broad scope of FastAPI removal
3. Key files needing attention:
   • reflex/app.py - Verify ASGI app handling works correctly
   • reflex/utils/exec.py - Test init.py deletion behavior
   • Any files that directly interact with HTTP endpoints

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