feat: Update footer with INPI branding

- Add INPI logo with link to inpi.pl
- Change copyright to INPI as creator
- Update contact email to maciej.pienczyn@inpi.pl
- Add WhatsApp contact link
- Make phone and email clickable (tel:/mailto:)
- Add CSS styles for footer creator section

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

templates/base.html

@@ -730,6 +730,37 @@
             font-size: var(--font-size-sm);
         }
 
+        .footer-creator {
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            gap: var(--spacing-sm);
+            margin-bottom: var(--spacing-sm);
+        }
+
+        .footer-creator span {
+            color: #94a3b8;
+        }
+
+        .creator-link {
+            display: inline-flex;
+            align-items: center;
+        }
+
+        .creator-logo {
+            height: 28px;
+            width: auto;
+            transition: opacity 0.2s ease;
+        }
+
+        .creator-link:hover .creator-logo {
+            opacity: 0.8;
+        }
+
+        .footer-section a {
+            color: #94a3b8;
+        }
+
         /* ============================================================
          * UTILITIES
          * ============================================================ */
@@ -1197,13 +1228,20 @@
                 </div>
                 <div class="footer-section">
                     <h3>Kontakt</h3>
-                    <p>Email: biuro@inpi.pl</p>
-                    <p>Telefon: +48 785 337 754</p>
+                    <p>Email: <a href="mailto:maciej.pienczyn@inpi.pl">maciej.pienczyn@inpi.pl</a></p>
+                    <p>Telefon: <a href="tel:+48785337754">+48 785 337 754</a></p>
+                    <p>WhatsApp: <a href="https://wa.me/48785337754" target="_blank" rel="noopener">+48 785 337 754</a></p>
                     <p>Adres: ul. Tomasza Rogali 11, 84-200 Wejherowo</p>
                 </div>
             </div>
             <div class="footer-bottom">
-                <p>&copy; {{ current_year }} Norda Biznes. Wszelkie prawa zastrzeżone.</p>
+                <div class="footer-creator">
+                    <span>Stworzone przez</span>
+                    <a href="https://inpi.pl" target="_blank" rel="noopener" class="creator-link">
+                        <img src="{{ url_for('static', filename='img/INPI_LOGO_white_background.png') }}" alt="INPI" class="creator-logo">
+                    </a>
+                </div>
+                <p>&copy; {{ current_year }} INPI. Wszelkie prawa zastrzeżone.</p>
             </div>
         </div>
     </footer>