Add stack Update, ComfyUI model manager, and slim ComfyUI stack.

Server UI gains Update on stack cards, ComfyUI Models tab with workflow
scan and downloads, and centralized comfyui_config. Model catalog and
download scripts move from stacks/comfyui to server-ui so ComfyUI stays a
minimal Docker wrapper for easier image updates.

stacks/server-ui/scripts/show-api-key.sh

@@ -9,16 +9,28 @@ PROD_ENV="/opt/control-plane/.env"
 DEV_ENV="${REPO_ROOT}/stacks/control-plane/.env"
 UI_PORT=8091
 
-if [[ -f "${DEV_ENV}" ]]; then
+# Production is canonical when installed; dev only as fallback.
+if [[ -f "${PROD_ENV}" ]]; then
+  ENV_FILE="${PROD_ENV}"
+  UI_PORT="$(grep '^SERVER_UI_PORT=' "${PROD_ENV}" 2>/dev/null | cut -d= -f2- || true)"
+  if [[ -z "${UI_PORT}" ]]; then
+    UI_PORT="$(sudo grep '^SERVER_UI_PORT=' "${PROD_ENV}" 2>/dev/null | cut -d= -f2- || true)"
+  fi
+elif [[ -r "${DEV_ENV}" ]]; then
+  ENV_FILE="${DEV_ENV}"
   UI_PORT="$(grep '^SERVER_UI_PORT=' "${DEV_ENV}" 2>/dev/null | cut -d= -f2- || echo 8091)"
-fi
-
-# Prefer dev copy when readable (same key after sync); else production.
-ENV_FILE="${DEV_ENV}"
-if [[ ! -r "${ENV_FILE}" ]]; then
+else
   ENV_FILE="${PROD_ENV}"
 fi
+[[ -n "${UI_PORT}" ]] || UI_PORT=8091
 
 # shellcheck source=print-api-key-instructions.sh
 source "${SCRIPT_DIR}/print-api-key-instructions.sh"
-print_api_key_instructions "${ENV_FILE}" "${UI_PORT}"
+if ! print_api_key_instructions "${ENV_FILE}" "${UI_PORT}" "${DEV_ENV}"; then
+  if [[ -r "${DEV_ENV}" && "${ENV_FILE}" != "${DEV_ENV}" ]]; then
+    echo "Fallback: odczyt z dev (prod nieczytelny bez sudo): ${DEV_ENV}"
+    print_api_key_instructions "${DEV_ENV}" "${UI_PORT}" ""
+  else
+    exit 1
+  fi
+fi