Simplify to standalone service on shared nocodb-network, add modem_num field

Strips embedded nocodb/postgres services from compose; switches to shared
nocodb-network. Adds modem_num to NocoDB field list. Fixes session cookie
secure flag. Removes previously-tracked XML template files (covered by .gitignore).

app.py

@@ -300,7 +300,7 @@ def _fetch_all_rows(view_id: str) -> list:
 NOCODB_FIELDS = [
     "hostname", "ip_address", "username", "password", "https_port",
     "use_https", "ssh_port", "location", "alias", "dept", "def_pass",
-    "snmp_auth_key", "snmp_priv_key", "fort_key", "vpn_subnets",
+    "snmp_auth_key", "snmp_priv_key", "fort_key", "vpn_subnets", "modem_num",
 ]
 
 
@@ -1475,7 +1475,7 @@ async def auth_login(username: str = Form(...), password: str = Form(...)):
         resp = RedirectResponse(url="/", status_code=303)
         resp.set_cookie(
             key=SESSION_COOKIE, value=token,
-            httponly=True, secure=True, samesite="lax",
+            httponly=True, secure=False, samesite="lax",
             max_age=SESSION_HOURS * 3600,
         )
         return resp