Add pyproject.toml for Railpack Python detection

[railway-app]

Problem

Railpack cannot detect the FoodSafe backend as a Python project because neither pyproject.toml nor setup.py exist in the backend/ directory, causing the build to fail with "Railpack could not determine how to build the app" despite requirements.txt and start.sh being present.

Solution

Added a minimal backend/pyproject.toml that declares the project name as "foodsafe", sets a Python 3.9+ requirement, and uses setuptools' dynamic dependencies to point at the existing requirements.txt — no duplication of the dependency list. This gives Railpack the marker it needs to identify and build the project, after which the existing start.sh runs Uvicorn as normal.

Changes

• Created backend/pyproject.toml

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Generated by Railway

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Project	Deployment	Actions	Updated (UTC)
food-safe	Ready	Preview, Comment	Mar 26, 2026 11:19am
food-safe-lsca	Ready	Preview, Comment	Mar 26, 2026 11:19am