feat: add download features to llm models

backend/internal/models/repository.go

@@ -590,6 +590,38 @@ func (r *Repository) ListSettings() ([]Setting, error) {
 	return settings, nil
 }
 
+// ── AI Role Providers ──────────────────────────────────────────────────────
+
+// GetRoleProvider returns the configured provider and model for a given role (summary/report/filter).
+// Falls back to the active provider if no role-specific provider is set.
+func (r *Repository) GetRoleProvider(role string) (*AIProvider, string, error) {
+	providerID, _ := r.GetSetting("ai_role_" + role + "_provider")
+	model, _ := r.GetSetting("ai_role_" + role + "_model")
+
+	if providerID != "" {
+		p, err := r.GetAIProviderByID(providerID)
+		if err == nil && p != nil {
+			if model == "" {
+				model = p.Model
+			}
+			return p, model, nil
+		}
+	}
+	// Fallback to active provider
+	p, err := r.GetActiveAIProvider()
+	if p != nil && model == "" {
+		model = p.Model
+	}
+	return p, model, err
+}
+
+func (r *Repository) SetRoleProvider(role, providerID, model string) error {
+	if err := r.SetSetting("ai_role_"+role+"_provider", providerID); err != nil {
+		return err
+	}
+	return r.SetSetting("ai_role_"+role+"_model", model)
+}
+
 // ── Reports ────────────────────────────────────────────────────────────────
 
 func (r *Repository) CreatePendingReport(userID string, summaryID *string, excerpt, question string) (*Report, error) {