Initial commit: aplicatie de cantarire si etichetare

Aplicatie Flask + SQLite pentru productie alimentara: cantarirea
componentelor unui produs finit si tiparirea etichetei prin QZ Tray.

- produse finite (retete) formate din componente cantarite
- designer vizual de etichete (mm/px, zona sigura, campuri variabile,
  cod QR cu continut din mai multe bucati)
- legare produs finit -> sablon de eticheta
- navigare pe doua taburi: Cantarire / Setari
- administrare: componente, produse finite, sabloane, campuri, istoric
- backup, resetare baza de date, checklist de pregatire, /healthz
- CLI de administrare si serviciu systemd pentru productie
- vendor/syncpulse-scale-bridge (GPL-3.0-or-later) pentru citirea cantarului

cantarire/routes/history.py

@@ -0,0 +1,65 @@
+"""Istoricul pachetelor si exportul CSV."""
+from __future__ import annotations
+
+import csv
+import io
+
+from flask import Blueprint, Response, render_template, request
+
+from ..repositories import get_recipe, list_packages, list_recipes, to_csv_rows
+from ..units import format_weight
+
+bp = Blueprint("history", __name__, url_prefix="/istoric")
+
+
+def _filters() -> dict:
+    recipe_id = request.args.get("recipe_id", "").strip()
+    status = request.args.get("status", "").strip()
+    return {
+        "date_from": request.args.get("date_from", "").strip(),
+        "date_to": request.args.get("date_to", "").strip(),
+        "recipe_id": int(recipe_id) if recipe_id.isdigit() else None,
+        "status": status if status in {"open", "done", "void"} else "",
+        "query": request.args.get("q", "").strip(),
+        "limit": 1000,
+    }
+
+
+def _totals(packages: list[dict]) -> str:
+    groups: dict[str, float] = {}
+    for package in packages:
+        if package.get("status") != "done":
+            continue
+        unit = package.get("unit") or ""
+        groups[unit] = groups.get(unit, 0.0) + float(package.get("total_weight") or 0)
+    return ", ".join(
+        f"{format_weight(value)} {unit}" for unit, value in sorted(groups.items())
+    ) or "0"
+
+
+@bp.get("")
+def index():
+    filters = _filters()
+    packages = list_packages(**filters)
+    recipe = get_recipe(filters["recipe_id"]) if filters["recipe_id"] else None
+    return render_template(
+        "history/list.html",
+        packages=packages,
+        filters=filters,
+        recipes=list_recipes(include_inactive=True),
+        total=_totals(packages),
+        selected_recipe=recipe,
+    )
+
+
+@bp.get("/export.csv")
+def export_csv():
+    packages = list_packages(**_filters())
+    buffer = io.StringIO()
+    writer = csv.writer(buffer, delimiter=";", lineterminator="\r\n")
+    writer.writerows(to_csv_rows(packages))
+    return Response(
+        buffer.getvalue(),
+        mimetype="text/csv; charset=utf-8",
+        headers={"Content-Disposition": 'attachment; filename="produse-finite.csv"'},
+    )