Add Sovran Systems SVG logo to hub header and onboarding welcome page

Agent-Logs-Url: https://github.com/naturallaw777/staging_alpha/sessions/fd3f0f95-4795-4d0b-8d16-fc00bd9d15b6

Co-authored-by: naturallaw777 <99053422+naturallaw777@users.noreply.github.com>

app/sovran_systemsos_web/templates/index.html

@@ -10,7 +10,10 @@
 
   <!-- Header bar -->
   <header class="header-bar">
-    <span class="title">Sovran_SystemsOS Hub</span>
+    <span class="title">
+      <img src="/static/logo-light.svg" alt="Sovran Systems" class="header-logo" />
+      Sovran_SystemsOS Hub
+    </span>
     <span class="role-badge" id="role-badge">Loading…</span>
     <button class="btn btn-update" id="btn-update" title="Run system update">
       <span class="update-badge" id="update-badge"></span>

app/sovran_systemsos_web/templates/onboarding.html

@@ -37,7 +37,9 @@
       <!-- ── Step 1: Welcome ── -->
       <div class="onboarding-panel" id="step-1">
         <div class="onboarding-hero">
-          <div class="onboarding-logo">🛡️</div>
+          <div class="onboarding-logo">
+            <img src="/static/logo-light.svg" alt="Sovran Systems" class="onboarding-logo-img" />
+          </div>
           <h1 class="onboarding-title">Welcome to Sovran_SystemsOS!</h1>
           <p class="onboarding-subtitle">Be Digitally Sovereign</p>
         </div>