refactor(warnings): report raw signal only, no severity/presentation

get_device_warnings() now returns only {code, meta} — severity, title,
message, and action are resolved centrally by netork's
WARNING_CATALOG (netork/core/device_warnings.py), not by the driver.
Keeps this driver independent of netork and avoids per-vendor drift in
how the same warning code is presented.

napalm_proxmox/system_mixin.py

@@ -288,11 +288,7 @@ class ProxmoxSystemMixin:
         try:
             lldpd_path = self._exec_ssh_command("command -v lldpd 2>/dev/null").strip()
             if not lldpd_path:
-                warnings.append({
-                    "code": "lldpd_not_installed",
-                    "severity": "warning",
-                    "action": "install_lldpd",
-                })
+                warnings.append({"code": "lldpd_not_installed"})
         except Exception as exc:
             logger.debug("Failed to check for lldpd: %s", exc)
 
@@ -302,13 +298,6 @@ class ProxmoxSystemMixin:
             if updates:
                 warnings.append({
                     "code": "updates_available",
-                    "severity": "warning",
-                    "title": (
-                        f"{len(updates)} package update"
-                        f"{'s' if len(updates) != 1 else ''} available"
-                    ),
-                    "message": None,
-                    "action": None,
                     "meta": {
                         "count": len(updates),
                         "packages": [u["name"] for u in updates],
@@ -322,12 +311,7 @@ class ProxmoxSystemMixin:
             sub = self._get_node_subscription()
             status = sub.get("status", "")
             if status in ("NotFound", "Invalid", "Expired"):
-                warnings.append({
-                    "code": "no_subscription",
-                    "severity": "warning",
-                    "action": None,
-                    "meta": {"status": status},
-                })
+                warnings.append({"code": "no_subscription", "meta": {"status": status}})
         except Exception as exc:
             logger.debug("Failed to check subscription status: %s", exc)