Add temp-SMS tool (SMSPool-backed temp-number marketplace) to Pleiades

- sms.py: NumberProvider abstraction + SMSPoolProvider + routes (/sms, rent, poll, release) + admin (/admin/sms)
- Reuses existing sats wallet + BTCPay deposit flow; charges per-rental against balance_sats
- Code detection, lazy expiry/release, per-user session limit, per-IP rate limit
- Verified end-to-end: rented Discord US +1 534 251 1825, wallet 5000->3500 sats, release refunded SMSPool to $7.45

templates/base.html

@@ -40,6 +40,7 @@
         <a href="/plans">Residential</a>
         <a href="/dedicated">Dedicated IPs</a>
         <a href="/hydraproxy">HydraProxy</a>
+        <a href="/sms">SMS</a>
         {% if user %}<a href="/dashboard">Dashboard</a><a href="/wallet">Wallet</a><a href="/quality">Quality</a><a href="/logout">Logout</a>
         {% else %}<a href="/login">Login</a><a class="cta" href="/signup">Get proxies</a>{% endif %}
       </div>