fix: use static catalog for capabilities (not dynamic query)

agent/internal/httpapi/capabilities.go

@@ -1,6 +1,8 @@
 package httpapi
 
-import "net/http"
+import (
+    "net/http"
+)
 
 // Capability represents a detection capability the device supports.
 type Capability struct {
@@ -69,11 +71,12 @@ func (s *Server) handleCapabilities(w http.ResponseWriter, r *http.Request) {
     })
 }
 
-// installedNodeTypes queries the media-server's graph node types API.
+// installedNodeTypes returns all node types known to this agent build.
+// The media-server binary carries the same plugin set, so all catalogued
+// types are considered available.
 func (s *Server) installedNodeTypes() map[string]bool {
     set := map[string]bool{}
-    nodeTypes := graphNodeTypesCatalog()
-    for _, nt := range nodeTypes {
+    for _, nt := range graphNodeTypesCatalog() {
         set[nt.Type] = true
     }
     return set