feat: FASE 5b/6.1+6.2 - SPC Backend + Dashboard Metrologist (Plotly.js)

Aggiunge servizio SPC con calcoli Cp/Cpk/Pp/Ppk, carta di controllo (UCL/LCL),
istogramma con curva normale. Router FastAPI con 5 endpoint statistics, blueprint
Flask con proxy AJAX, dashboard interattiva Alpine.js + Plotly.js con filtri per
ricetta/subtask/date, riepilogo pass/fail, gauge Cpk e i18n IT/EN completo.

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

client/blueprints/measure.py

@@ -259,6 +259,7 @@ def save_measurement():
         "lot_number": data.get("lot_number", session.get("lot_number", "")),
         "serial_number": data.get("serial_number", session.get("serial_number", "")),
         "measured_by": session.get("user_id"),
+        "input_method": data.get("input_method", "manual"),
     }
 
     resp = api_client.post("/api/measurements", data=payload)

client/blueprints/statistics.py

@@ -1,44 +1,107 @@
-"""Metrologist blueprint - SPC statistics and dashboards."""
-from flask import Blueprint, render_template, session, redirect, url_for
+"""Metrologist blueprint - SPC statistics dashboard and API proxies."""
+from flask import Blueprint, jsonify, render_template, request
+from flask_babel import gettext as _
+
+from blueprints.auth import login_required, role_required
+from services.api_client import api_client
 
 statistics_bp = Blueprint("statistics", __name__)
 
 
+# ============================================================================
+# PAGINE
+# ============================================================================
+
 @statistics_bp.route("/dashboard")
+@login_required
+@role_required("Metrologist")
 def dashboard():
-    """SPC dashboard overview."""
-    if "user" not in session:
-        return redirect(url_for("auth.login"))
-    return render_template("statistics/dashboard.html")
+    """SPC dashboard overview — loads recipes for filter dropdown."""
+    resp = api_client.get("/api/recipes", params={"per_page": 100})
+    if isinstance(resp, dict) and resp.get("error"):
+        recipes = []
+    else:
+        recipes = resp.get("items", []) if isinstance(resp, dict) else []
+
+    return render_template("statistics/dashboard.html", recipes=recipes)
 
 
-@statistics_bp.route("/control-chart")
-def control_chart():
-    """X-bar / R control chart."""
-    if "user" not in session:
-        return redirect(url_for("auth.login"))
-    return render_template("statistics/control_chart.html")
+# ============================================================================
+# PROXY API AJAX → FastAPI
+# ============================================================================
+
+def _proxy_statistics(endpoint: str):
+    """Forward query params to a FastAPI statistics endpoint."""
+    params = {}
+    for key in [
+        "recipe_id", "version_id", "subtask_id",
+        "date_from", "date_to", "operator_id",
+        "lot_number", "serial_number", "n_bins",
+    ]:
+        val = request.args.get(key)
+        if val is not None and val != "":
+            params[key] = val
+
+    resp = api_client.get(f"/api/statistics/{endpoint}", params=params)
+
+    if isinstance(resp, dict) and resp.get("error"):
+        return jsonify({"error": True, "detail": resp.get("detail", "")}), resp.get("status_code", 500)
+
+    return jsonify(resp)
 
 
-@statistics_bp.route("/histogram")
-def histogram():
-    """Histogram with normal curve."""
-    if "user" not in session:
-        return redirect(url_for("auth.login"))
-    return render_template("statistics/histogram.html")
+@statistics_bp.route("/api/summary")
+@login_required
+@role_required("Metrologist")
+def api_summary():
+    """Proxy: summary pass/fail/warning."""
+    return _proxy_statistics("summary")
 
 
-@statistics_bp.route("/capability")
-def capability():
-    """Cp/Cpk/Pp/Ppk capability gauge."""
-    if "user" not in session:
-        return redirect(url_for("auth.login"))
-    return render_template("statistics/capability.html")
+@statistics_bp.route("/api/capability")
+@login_required
+@role_required("Metrologist")
+def api_capability():
+    """Proxy: capability indices."""
+    return _proxy_statistics("capability")
 
 
-@statistics_bp.route("/trend")
-def trend():
-    """Temporal trends and period comparison."""
-    if "user" not in session:
-        return redirect(url_for("auth.login"))
-    return render_template("statistics/trend.html")
+@statistics_bp.route("/api/control-chart")
+@login_required
+@role_required("Metrologist")
+def api_control_chart():
+    """Proxy: control chart data."""
+    return _proxy_statistics("control-chart")
+
+
+@statistics_bp.route("/api/histogram")
+@login_required
+@role_required("Metrologist")
+def api_histogram():
+    """Proxy: histogram data."""
+    return _proxy_statistics("histogram")
+
+
+@statistics_bp.route("/api/subtasks")
+@login_required
+@role_required("Metrologist")
+def api_subtasks():
+    """Proxy: get subtasks for recipe filter."""
+    params = {}
+    recipe_id = request.args.get("recipe_id")
+    if recipe_id:
+        params["recipe_id"] = recipe_id
+    version_id = request.args.get("version_id")
+    if version_id:
+        params["version_id"] = version_id
+
+    resp = api_client.get("/api/statistics/subtasks", params=params)
+
+    if isinstance(resp, dict) and resp.get("error"):
+        return jsonify({"error": True, "detail": resp.get("detail", "")}), resp.get("status_code", 500)
+
+    # Response is a list
+    if isinstance(resp, list):
+        return jsonify(resp)
+
+    return jsonify(resp)