feat(client): filter select_recipe by STATION_CODE with error fallback

Replace generic /api/recipes call with api_client.get_station_recipes(STATION_CODE).
Return 503 station_not_configured.html when STATION_CODE env var is unset.
Add station indicator to recipe selection page header.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/blueprints/measure.py

@@ -22,8 +22,18 @@ measure_bp = Blueprint("measure", __name__)
 @role_required("MeasurementTec")
 def select_recipe():
     """Recipe selection page with search and barcode support."""
-    # Load recipes from API
-    resp = api_client.get("/api/recipes", params={"per_page": 100})
+    # Fail-fast if STATION_CODE is not configured
+    if not Config.STATION_CODE:
+        return render_template("errors/station_not_configured.html"), 503
+
+    # Load recipes filtered by station
+    try:
+        resp = api_client.get_station_recipes(Config.STATION_CODE)
+    except Exception as e:
+        return render_template(
+            "errors/station_not_configured.html", error=str(e),
+        ), 502
+
     if isinstance(resp, dict) and resp.get("error"):
         flash(
             _("Errore nel caricamento delle ricette: %(detail)s",
@@ -43,6 +53,7 @@ def select_recipe():
     return render_template(
         "measure/select_recipe.html",
         recipes=recipes,
+        station_code=Config.STATION_CODE,
         auto_recipe_code=auto_recipe_code,
         auto_lot=auto_lot,
         auto_serial=auto_serial,