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/__init__.py

@@ -0,0 +1,60 @@
+"""Aplicatia Flask: fabrica, blueprint-uri, filtre Jinja."""
+from __future__ import annotations
+
+from datetime import datetime
+from pathlib import Path
+
+from flask import Flask
+
+from . import db
+from .config import Config
+from .labels import _format_datetime, _format_weight
+from .logging_setup import configure_logging
+from .scale import create_scale
+
+
+def create_app(test_config: dict | None = None) -> Flask:
+    app = Flask(__name__, instance_relative_config=False)
+    app.config.from_object(Config)
+    if test_config:
+        app.config.update(test_config)
+
+    instance_dir = Path(app.config["INSTANCE_DIR"])
+    instance_dir.mkdir(parents=True, exist_ok=True)
+    Path(app.config["DATABASE"]).parent.mkdir(parents=True, exist_ok=True)
+
+    db.register(app)
+    create_scale(app)
+    if not app.config.get("TESTING"):
+        configure_logging()
+
+    with app.app_context():
+        db.init_db()
+
+    from .routes import (api, components, fields, history, label_templates, main, monitor,
+                         printing, recipes)
+
+    app.register_blueprint(main.bp)
+    app.register_blueprint(components.bp)
+    app.register_blueprint(recipes.bp)
+    app.register_blueprint(label_templates.bp)
+    app.register_blueprint(fields.bp)
+    app.register_blueprint(printing.bp)
+    app.register_blueprint(history.bp)
+    app.register_blueprint(monitor.bp)
+    app.register_blueprint(api.bp)
+
+    app.jinja_env.filters["weight"] = _format_weight
+    app.jinja_env.filters["dt"] = _format_datetime
+
+    @app.context_processor
+    def inject_globals():
+        from .db import all_settings
+
+        return {
+            "app_settings": all_settings(),
+            "current_year": datetime.now().year,
+            "app_version": "0.1.0",
+        }
+
+    return app