Persist and surface endpoint installed-software (SBOM)

The endpoint agent already reports an installed-software list (SBOM), but ingress dropped it: the collector schema had no entry for it and there was nowhere to store it, so operators could not see what is installed on a PC.

Persist it as a per-asset snapshot in a new endpointapplications table, replaced on every report (current inventory is what operators ask for, not install history). Add applications to the collector schema and KNOWN_PAYLOAD_KEYS so ingress stops discarding it, a read route for the raw collection, and a collapsed-by-default Installed software panel to surface it. appid is nullable groundwork for a future Managed Applications link; no matcher is wired yet.

plugins/endpoints/api/routes.py

@@ -21,7 +21,7 @@ from shopdb.api import (
     AuditLog, collector_authorized, User,
 )
 
-from ..models import EndpointState, EndpointEvent, EndpointCommand
+from ..models import EndpointState, EndpointEvent, EndpointCommand, EndpointApplication
 from ..commands import COMMAND_ALLOWLIST, is_allowed_action, ALLOWED_ACTIONS_FOR, row_actions_for, requires_target, action_targetkind, elevated_permission_for
 from ..eventcatalog import CRITICAL_EVENT_IDS, event_severity, event_title
 
@@ -674,6 +674,32 @@ def panel_interfaces(asset_id: int):
     return success_response(rows)
 
 
+@endpoints_bp.route('/asset/<int:asset_id>/applications', methods=['GET'])
+@require_permission('endpoints.view')
+def panel_applications(asset_id: int):
+    """Table panel: the installed-software (SBOM) snapshot for this endpoint.
+
+    Reads the endpointapplications rows the collector last wrote for this asset
+    (a per-report snapshot, not history) and returns them sorted by name. This
+    is the raw discovered inventory: appid is carried through but not yet linked
+    to the applications catalog ("Managed Applications"), so no managed status
+    is surfaced here. An endpoint with no reported SBOM yields no rows and the
+    panel hides itself.
+    """
+    rows = (EndpointApplication.query
+            .filter_by(assetid=asset_id)
+            .order_by(db.func.lower(EndpointApplication.displayname))
+            .all())
+    return success_response([
+        {
+            'displayname': row.displayname,
+            'displayversion': row.displayversion or '-',
+            'publisher': row.publisher or '-',
+        }
+        for row in rows
+    ])
+
+
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 # Dashboard
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