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/logging_setup.py

@@ -0,0 +1,57 @@
+"""Logging: jurnal de acces lizibil, fara zgomotul polling-ului.
+
+Flask/werkzeug scrie un rand pentru fiecare cerere. Pagina de cantarire
+interogheaza greutatea de mai multe ori pe secunda, deci jurnalul devine
+inutilizabil. Aici:
+  - cererile de polling (/api/weight) si fisierele statice nu sunt logate;
+  - erorile (4xx/5xx) sunt pastrate intotdeauna;
+  - jurnalul aplicatiei merge la stderr, cu timestamp.
+"""
+from __future__ import annotations
+
+import logging
+import re
+import sys
+
+QUIET_PREFIXES = (
+    "GET /api/weight",
+    "GET /static/",
+    "GET /favicon.ico",
+)
+
+# Werkzeug access line: ... "GET /path HTTP/1.1" 200 -
+_STATUS_RE = re.compile(r'"\s(\d{3})\s')
+
+
+class _QuietPolling(logging.Filter):
+    """Drop access-log records for polling and static assets, keep errors."""
+
+    def filter(self, record: logging.LogRecord) -> bool:
+        try:
+            message = record.getMessage()
+        except Exception:  # noqa: BLE001 - never let logging break a request
+            return True
+        if not any(prefix in message for prefix in QUIET_PREFIXES):
+            return True
+        match = _STATUS_RE.search(message)
+        if match is None:
+            return True
+        # Keep only failures (4xx / 5xx); 2xx and 304 are noise.
+        return not match.group(1).startswith(("2", "3"))
+
+
+def configure_logging(level: int = logging.INFO) -> None:
+    handler = logging.StreamHandler(sys.stderr)
+    handler.setFormatter(logging.Formatter("%(asctime)s %(levelname)-7s %(name)s: %(message)s",
+                                          "%H:%M:%S"))
+    root = logging.getLogger()
+    if not root.handlers:
+        root.addHandler(handler)
+    root.setLevel(level)
+
+    werkzeug = logging.getLogger("werkzeug")
+    werkzeug.setLevel(logging.INFO)
+    if not any(isinstance(f, _QuietPolling) for f in werkzeug.filters):
+        werkzeug.addFilter(_QuietPolling())
+
+    logging.getLogger("scale_bridge").setLevel(logging.WARNING)