Add reproducible environment setup script

.gitignore

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+.venv/
+__pycache__/
+*.pyc
+
+logs/*
+exports/*
+outputs/*
+diagnostics/*
+archive/current/*
+
+inputs/uploads/*
+inputs/examples/*
+!*/.gitkeep
+
+.env

requirements.txt

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+fastapi
+uvicorn[standard]
+python-multipart
+python-docx
+pendulum

scripts/setup-env.sh

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+#!/usr/bin/env bash
+set -e
+
+cd "$(dirname "$0")/.."
+
+python3 -m venv .venv
+. .venv/bin/activate
+
+python -m pip install --upgrade pip
+python -m pip install -r requirements.txt
+
+echo "Ready."
+echo "Activate with: source .venv/bin/activate"