feat: disciple link

internal/handler/disciple.go

@@ -9,10 +9,33 @@ import (
 
 type DiscipleHandler struct {
 	repo *repository.DiscipleRepo
+	// users (Postgres) resolves which disciples have a platform account
+	// linked by an admin. Separate store from the disciple records
+	// themselves, hence the second dependency.
+	users *repository.UserRepo
 }
 
-func NewDiscipleHandler(repo *repository.DiscipleRepo) *DiscipleHandler {
-	return &DiscipleHandler{repo: repo}
+func NewDiscipleHandler(repo *repository.DiscipleRepo, users *repository.UserRepo) *DiscipleHandler {
+	return &DiscipleHandler{repo: repo, users: users}
+}
+
+// Linked — GET /disciples/linked — every disciple that has a platform account,
+// as {disciple_id, handle, name, avatar_url}. Public and unpaged: only Śrīla
+// Prabhupāda's own disciples are ever linked, so the set is tiny and the
+// /disciples browser fetches it once to highlight the matching cards.
+func (h *DiscipleHandler) Linked(w http.ResponseWriter, r *http.Request) {
+	if h.users == nil {
+		// Degraded boot without Postgres — an empty set just means "no
+		// highlights", which is a fine reading experience.
+		response.JSON(w, http.StatusOK, []repository.DiscipleLink{})
+		return
+	}
+	links, err := h.users.ListDiscipleLinks(r.Context())
+	if err != nil {
+		response.Error(w, http.StatusInternalServerError, "failed to fetch linked disciples")
+		return
+	}
+	response.JSON(w, http.StatusOK, links)
 }
 
 func (h *DiscipleHandler) List(w http.ResponseWriter, r *http.Request) {