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/mobile.html

@@ -0,0 +1,30 @@
+{% extends "base.html" %}
+{% block title %}Mobile — Clean Proxys{% endblock %}
+{% block body %}
+<div class="hero" style="padding:64px 0 28px">
+  <h1 style="font-size:36px">Mobile <span class="grad">proxies</span>.</h1>
+  <p class="lede">4G carrier, static mobile, and premium residential IPs — sourced and delivered by Clean Proxys. You pay, we provision, you connect.</p>
+</div>
+
+{% if err %}
+<div class="flash warn">Mobile catalog is temporarily unavailable: {{ err }}<br><span class="muted">(The catalog below still shows what's offered.)</span></div>
+{% else %}
+<div class="statsbar">
+  <div class="s"><div class="n grad">${{ account.balance_usd if account else '—' }}</div><div class="l">Account balance</div></div>
+  <div class="s"><div class="n grad">{{ account.username if account else '—' }}</div><div class="l">Account</div></div>
+</div>
+{% endif %}
+
+<div class="grid">
+  {% for key, p in products.items() %}
+  <div class="card plan">
+    <h3>{{ p.name }}</h3>
+    <p>{{ p.desc }}</p>
+    <div class="price">{{ p.price_sats }} <span style="font-size:16px;color:var(--muted)">sats / {{ p.unit }}</span></div>
+    <p class="muted" style="font-size:13px;margin-top:8px">Delivered by Clean Proxys — your live proxy is provisioned after payment.</p>
+  </div>
+  {% endfor %}
+</div>
+
+<p class="muted" style="margin-top:26px">These are fulfilled on request. For instant self-serve, see <a href="/plans">residential plans</a> and <a href="/dedicated">dedicated IPs</a>.</p>
+{% endblock %}