Rebrand HydraProxy tier -> Mobile (stop leaking upstream supplier)

Customer-facing site no longer names the upstream broker. Rename:
- nav + page: HydraProxy -> Mobile, /hydraproxy -> /mobile
- hydraproxy.html -> mobile.html, all 'brokered/HydraProxy' copy reworded to
  owned 'Clean Proxys' language
- dashboard: 'HydraProxy orders (broker-fulfilled)' -> 'Mobile orders'
- admin panel keeps upstream names (internal only, drjones needs them)

templates/dashboard.html

@@ -96,7 +96,7 @@
 
 {% if hydra %}
 <div class="card" style="margin-top:18px">
-  <h3>HydraProxy orders <span class="muted" style="font-size:12px">(broker-fulfilled)</span></h3>
+  <h3>Mobile orders <span class="muted" style="font-size:12px">(provisioning)</span></h3>
   {% for h in hydra %}
   <div style="border:1px solid var(--border);border-radius:8px;padding:12px;margin:10px 0">
     <div style="display:flex;justify-content:space-between">
@@ -110,7 +110,7 @@
         <button onclick="copy(this.previousElementSibling)">Copy</button>
       </div>
     {% elif h.status == 'pending_fulfillment' %}
-      <p class="muted" style="font-size:12px;margin:6px 0 0">Broker is fulfilling your order — your proxy appears here when ready.</p>
+      <p class="muted" style="font-size:12px;margin:6px 0 0">Your proxy is being provisioned — it appears here when ready.</p>
     {% endif %}
   </div>
   {% endfor %}