fix(frontend): fix all 25->26 signal count inconsistencies

frontend/index.html — three places still said 25 signals:
line 1040: '25 detection signals run in parallel' -> 26
line 1154: '25 forensic signals' -> 26
line 1187: footer badge '25 Signals' -> 26

Also updated line 1040 to say '8 independent methods' (was 7)
to reflect the addition of own_embedding as an active method.

frontend/index.html

@@ -1037,7 +1037,7 @@ footer {
         <div class="how-card">
             <div class="how-step">02</div>
             <h4>Forensic Analysis</h4>
-            <p>25 detection signals run in parallel across 7 independent methods.</p>
+            <p>26 detection signals run in parallel across 8 independent methods.</p>
         </div>
         <div class="how-card">
             <div class="how-step">03</div>
@@ -1151,7 +1151,7 @@ footer {
     <div class="footer-inner">
         <div class="footer-brand">
             <h3>VeriFile-X</h3>
-            <p>Advanced AI image verification platform. 25 forensic signals. Cryptographic evidence reports. Built for accuracy, transparency, and trust.</p>
+            <p>Advanced AI image verification platform. 26 forensic signals. Cryptographic evidence reports. Built for accuracy, transparency, and trust.</p>
         </div>
         <div class="footer-col">
             <h4>Product</h4>
@@ -1184,7 +1184,7 @@ footer {
     <div class="footer-bottom">
         <span>© 2026 VeriFile-X — Built for Trust &amp; Transparency</span>
         <div class="footer-badges">
-            <span class="footer-badge">25 Signals</span>
+            <span class="footer-badge">26 Signals</span>
             <span class="footer-badge">Privacy First</span>
             <span class="footer-badge">Open Source</span>
         </div>