Add Django site, Docker packaging, and beta/prod Gitea deploys.

Unignore site/ (was blocked by mkdocs /site rule), add compose/Docker/uv tooling, and split deploys so push to main goes to beta while prod stays manual.

site/messaging/providers/sms/smtp2go.py

@@ -0,0 +1,42 @@
+"""SMTP2GO SMS REST API."""
+
+import logging
+
+import requests
+from django.conf import settings
+
+logger = logging.getLogger(__name__)
+
+
+def send_sms(message) -> str:
+    contact = message.contact
+    if not contact.phone:
+        raise ValueError("Contact has no phone number")
+
+    api_key = settings.SMTP2GO_SMS_API_KEY
+    if not api_key:
+        raise RuntimeError("SMTP2GO_SMS_API_KEY is not configured")
+
+    campaign = message.campaign
+    body = message.body_snapshot or campaign.body_override or (
+        campaign.template.body if campaign.template else ""
+    )
+
+    payload = {
+        "api_key": api_key,
+        "to": contact.phone,
+        "text": body[:1600],
+    }
+    response = requests.post(
+        settings.SMTP2GO_SMS_API_URL,
+        json=payload,
+        timeout=30,
+    )
+    response.raise_for_status()
+    data = response.json() if response.content else {}
+    # SMTP2GO returns varying shapes; store a useful id when present.
+    return str(
+        data.get("data", {}).get("sms_id")
+        or data.get("request_id")
+        or f"sms-{message.pk}"
+    )