refactor(server): finish the Org to Instance rename

Private identifiers plan 0b's naming map missed, plus the OrgOIDC model type.
No wire format, database field or route changes.

server/internal/services/instance_oidc.go

@@ -10,10 +10,10 @@ import (
 	"go.mongodb.org/mongo-driver/v2/mongo/options"
 )
 
-func GetInstanceOIDC(instanceID string) (*models.OrgOIDC, error) {
+func GetInstanceOIDC(instanceID string) (*models.InstanceOIDC, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
-	var o models.OrgOIDC
+	var o models.InstanceOIDC
 	err := db.Col("instance_oidc").FindOne(ctx, bson.M{"instance_id": instanceID}).Decode(&o)
 	if err != nil {
 		return nil, err
@@ -29,7 +29,7 @@ func GetInstanceOIDCSecret(instanceID string) (string, error) {
 	return decryptString(o.ClientSecretEnc)
 }
 
-func SaveOrgOIDC(instanceID, issuer, clientID, clientSecret string, enabled bool) error {
+func SaveInstanceOIDC(instanceID, issuer, clientID, clientSecret string, enabled bool) error {
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
 	set := bson.M{