feat: FASE 7 - Polish & Testing (security, i18n, test suite, docs)

Security hardening: CORS lockdown, rate limiting middleware con sliding
window e eviction IP stale, security headers (CSP, HSTS, X-Frame-Options),
session cookie hardening, filename sanitization upload.

i18n completion: internazionalizzati barcode.js e csv-export.js con bridge
window.BARCODE_I18N/CSV_I18N, aggiornati .po IT/EN con 27 nuove stringhe.

Tablet UX: touch target 44px per dispositivi coarse pointer.

Test suite: 101 test totali (76 server + 25 client), copertura completa
di tutti i router API, autenticazione, ruoli, CRUD, SPC, file upload,
security integration. Infrastruttura SQLite async in-memory con fixtures.

Fix critici: MissingGreenlet in recipe_service (selectinload eager),
route ordering tasks.py, auth_service bcrypt diretto, Measurement.id
Integer per SQLite.

Documentazione: API.md (riferimento completo 40+ endpoint),
DEPLOYMENT.md (guida produzione con Docker/Nginx/SSL),
USER_GUIDE.md (manuale utente per ruolo).

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

client/tests/conftest.py

@@ -0,0 +1,104 @@
+"""Shared test fixtures for Flask client tests.
+
+Creates a Flask test client and mocks the API client (requests to FastAPI server).
+"""
+import sys
+from pathlib import Path
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+# Ensure the client package is importable
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
+
+from app import create_app
+
+# All blueprint modules that import api_client at module level.
+# We must patch at the *use-site* (blueprint namespace) so the local name
+# ``api_client`` in each module points to the mock, not the real singleton.
+_API_CLIENT_PATCH_TARGETS = [
+    "blueprints.auth.api_client",
+    "blueprints.maker.api_client",
+    "blueprints.measure.api_client",
+    "blueprints.statistics.api_client",
+]
+
+
+@pytest.fixture
+def flask_app():
+    """Create a Flask application configured for testing."""
+    app = create_app()
+    app.config["TESTING"] = True
+    app.config["WTF_CSRF_ENABLED"] = False
+    app.config["SECRET_KEY"] = "test-secret-key"
+
+    # Provide default template variables that are normally set inside
+    # specific Jinja2 blocks and therefore not visible to sibling blocks.
+    @app.context_processor
+    def _inject_template_defaults():
+        return {
+            "versions": [],
+            "current_version": None,
+        }
+
+    return app
+
+
+@pytest.fixture
+def client(flask_app):
+    """Yield a Flask test client."""
+    with flask_app.test_client() as test_client:
+        yield test_client
+
+
+@pytest.fixture
+def logged_in_client(flask_app):
+    """Yield a Flask test client with a logged-in session."""
+    with flask_app.test_client() as test_client:
+        with test_client.session_transaction() as sess:
+            sess["api_key"] = "test-api-key-12345"
+            sess["user"] = {
+                "id": 1,
+                "username": "testuser",
+                "display_name": "Test User",
+                "roles": ["Maker", "MeasurementTec", "Metrologist"],
+                "is_admin": True,
+                "language_pref": "en",
+                "theme_pref": "light",
+                "active": True,
+            }
+            sess["user_id"] = 1
+            sess["language"] = "en"
+            sess["theme"] = "light"
+        yield test_client
+
+
+@pytest.fixture
+def mock_api_client():
+    """Patch the api_client singleton used in blueprints.
+
+    Patches every blueprint module that does
+    ``from services.api_client import api_client`` so the local name
+    in each module resolves to the same MagicMock instance.
+
+    Yields the mocked APIClient instance so tests can configure responses:
+
+        mock_api_client.get.return_value = {"items": [...], "total": 1}
+        mock_api_client.post.return_value = {"user": {...}, "api_key": "..."}
+    """
+    mock = MagicMock()
+    # Default: all methods return empty success dict
+    mock.get.return_value = {}
+    mock.post.return_value = {}
+    mock.put.return_value = {}
+    mock.delete.return_value = {}
+
+    # Stack patches for every blueprint that imports api_client
+    patchers = [patch(target, mock) for target in _API_CLIENT_PATCH_TARGETS]
+    for p in patchers:
+        p.start()
+
+    yield mock
+
+    for p in patchers:
+        p.stop()