Fix healthcheck redirect issue — disable FastAPI redirect_slashes

[railway-app]

Problem

Railway's healthcheck probe sends GET /health and does not follow redirects. FastAPI's default redirect_slashes=True causes it to return a 307 Temporary Redirect to /health/ when the route is matched with trailing-slash normalization, so the probe sees a 307 and marks the deployment as failed — resulting in 18 consecutive deployment failures.

Solution

Added redirect_slashes=False to the FastAPI(...) initialization in backend/app/main.py. This disables FastAPI's automatic trailing-slash redirect behavior, so GET /health matches the @app.get("/health") route directly and returns 200 OK without any redirect.

Changes

• Modified backend/app/main.py

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