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/printing.py

@@ -0,0 +1,46 @@
+"""Pagina de printare a unei etichete de produs finit."""
+from __future__ import annotations
+
+from flask import Blueprint, abort, current_app, render_template, request
+
+from ..db import all_settings, get_setting
+from ..labels import LabelTemplateError, print_payload
+from ..repositories import get_default_template, get_package, get_recipe, get_template
+
+bp = Blueprint("printing", __name__)
+
+
+@bp.get("/labels/<int:package_id>/print")
+def print_label(package_id: int):
+    package = get_package(package_id)
+    if package is None:
+        abort(404)
+
+    template_id = request.args.get("template_id") or package.get("template_id")
+    configured = get_setting("default_template_id", "")
+    template = None
+    if template_id:
+        try:
+            template = get_template(int(template_id))
+        except (TypeError, ValueError):
+            template = None
+    if template is None and configured.isdigit():
+        template = get_template(int(configured))
+    template = template or get_default_template()
+    if template is None:
+        abort(409, "Nu exista niciun sablon de eticheta configurat.")
+
+    recipe = get_recipe(package["recipe_id"]) if package["recipe_id"] else None
+    try:
+        payload = print_payload(package, template, all_settings(), recipe)
+    except LabelTemplateError as exc:
+        abort(500, str(exc))
+
+    settings = all_settings()
+    auto = request.args.get("auto")
+    if auto is None:
+        auto = settings.get("auto_print", "1") == "1" and current_app.config["AUTO_PRINT"]
+    else:
+        auto = auto not in {"0", "false", "no"}
+
+    return render_template("label_print.html", payload=payload, auto=bool(auto), preview=False)