Add app start script

scripts/start.sh

@@ -0,0 +1,72 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+root_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+frontend_dir="${root_dir}/frontend"
+
+load_env_file() {
+  local env_file="$1"
+  [[ -f "${env_file}" ]] || return 0
+
+  while IFS= read -r line || [[ -n "${line}" ]]; do
+    line="${line#"${line%%[![:space:]]*}"}"
+    line="${line%"${line##*[![:space:]]}"}"
+    [[ -z "${line}" || "${line}" == \#* ]] && continue
+
+    local key="${line%%=*}"
+    local value="${line#*=}"
+    key="${key%"${key##*[![:space:]]}"}"
+    key="${key#export }"
+    value="${value#"${value%%[![:space:]]*}"}"
+    value="${value%"${value##*[![:space:]]}"}"
+    if [[ "${value}" == \"*\" && "${value}" == *\" ]]; then
+      value="${value:1:-1}"
+    elif [[ "${value}" == \'*\' && "${value}" == *\' ]]; then
+      value="${value:1:-1}"
+    fi
+
+    if [[ -z "${!key+x}" ]]; then
+      export "${key}=${value}"
+    fi
+  done < "${env_file}"
+}
+
+load_env_file "${root_dir}/.env"
+load_env_file "${root_dir}/.env.local"
+
+if [[ -x "${root_dir}/.venv/bin/python" ]]; then
+  python_cmd="${root_dir}/.venv/bin/python"
+else
+  python_cmd="${PYTHON_BIN:-python3}"
+fi
+
+if [[ -n "${BUN_BIN:-}" ]]; then
+  bun_cmd="${BUN_BIN}"
+elif [[ -x "${HOME}/.bun/bin/bun" ]]; then
+  bun_cmd="${HOME}/.bun/bin/bun"
+else
+  bun_cmd="bun"
+fi
+
+host="${HOST:-0.0.0.0}"
+port="${PORT:-8000}"
+
+if ! command -v "${python_cmd}" >/dev/null 2>&1; then
+  echo "Python runtime not found: ${python_cmd}" >&2
+  exit 1
+fi
+
+if ! command -v "${bun_cmd}" >/dev/null 2>&1; then
+  echo "Bun runtime not found: ${bun_cmd}" >&2
+  exit 1
+fi
+
+echo "==> Building frontend"
+(
+  cd "${frontend_dir}"
+  "${bun_cmd}" run build
+)
+
+echo "==> Starting backend on ${host}:${port}"
+cd "${root_dir}"
+exec "${python_cmd}" -m uvicorn app:app --host "${host}" --port "${port}"