feat: Add extended health check endpoint /health/full

- Checks 14 critical endpoints (public + admin pages)
- Returns JSON with pass/fail status for each endpoint
- HTTP 200 if all OK, HTTP 503 if any failures
- Useful for deployment verification and monitoring

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app.py

@@ -781,6 +781,93 @@ def health():
     return {'status': 'ok'}, 200
 
 
+@app.route('/health/full')
+def health_full():
+    """
+    Extended health check - verifies all critical endpoints.
+    Returns detailed status of each endpoint.
+    Access: /health/full
+    """
+    results = []
+    all_ok = True
+
+    # List of endpoints to check (path, name)
+    endpoints = [
+        ('/', 'Strona główna'),
+        ('/login', 'Logowanie'),
+        ('/register', 'Rejestracja'),
+        ('/companies', 'Katalog firm'),
+        ('/release-notes', 'Historia zmian'),
+        ('/search?q=test', 'Wyszukiwarka'),
+        ('/raporty', 'Raporty'),
+        ('/api/companies', 'API: Lista firm'),
+        ('/admin/security', 'Admin: Bezpieczeństwo'),
+        ('/admin/news', 'Admin: Aktualności'),
+        ('/admin/seo', 'Admin: SEO'),
+        ('/admin/social-media', 'Admin: Social Media'),
+        ('/admin/analytics', 'Admin: Analityka'),
+    ]
+
+    # Dodaj losową firmę do sprawdzenia
+    db = SessionLocal()
+    try:
+        random_company = db.query(Company).first()
+        if random_company:
+            endpoints.append((f'/company/{random_company.slug}', f'Profil: {random_company.name[:25]}'))
+    finally:
+        db.close()
+
+    # Testuj każdy endpoint używając test client
+    with app.test_client() as client:
+        for path, name in endpoints:
+            try:
+                response = client.get(path, follow_redirects=False)
+                status = response.status_code
+
+                # 200 = OK, 302 = redirect (np. do logowania) = OK
+                # 500 = błąd serwera, 404 = nie znaleziono
+                if status in (200, 302, 304):
+                    results.append({
+                        'endpoint': path,
+                        'name': name,
+                        'status': status,
+                        'ok': True
+                    })
+                else:
+                    results.append({
+                        'endpoint': path,
+                        'name': name,
+                        'status': status,
+                        'ok': False
+                    })
+                    all_ok = False
+
+            except Exception as e:
+                results.append({
+                    'endpoint': path,
+                    'name': name,
+                    'status': 500,
+                    'ok': False,
+                    'error': str(e)[:100]
+                })
+                all_ok = False
+
+    # Podsumowanie
+    passed = sum(1 for r in results if r['ok'])
+    failed = len(results) - passed
+
+    return {
+        'status': 'ok' if all_ok else 'degraded',
+        'summary': {
+            'total': len(results),
+            'passed': passed,
+            'failed': failed
+        },
+        'endpoints': results,
+        'timestamp': datetime.now().isoformat()
+    }, 200 if all_ok else 503
+
+
 # ============================================================
 # PUBLIC ROUTES
 # ============================================================