fix(api): accept the current compatible-provider connection id scheme in the models test route (#8326) (#8359)

src/shared/utils/compatibleProviderId.ts

@@ -0,0 +1,36 @@
+/**
+ * Single source of truth for recognizing a "compatible provider" connection
+ * ID — the dynamic IDs generated for openai-compatible / anthropic-compatible
+ * custom nodes (src/app/api/provider-nodes/route.ts).
+ *
+ * Generated shapes (all four must match):
+ *   - openai-compatible-chat-<uuid>
+ *   - openai-compatible-responses-<uuid>
+ *   - anthropic-compatible-<uuid>
+ *   - anthropic-compatible-cc-<uuid>
+ *
+ * Built from the same prefix constants used at ID-generation time
+ * (src/shared/constants/providers.ts) so the generator and the validator can
+ * never drift apart again. See #8326: the previous inline regex required a
+ * literal "-chat-" segment, rejecting 3 of the 4 shapes the system actually
+ * generates.
+ *
+ * @module shared/utils/compatibleProviderId
+ */
+
+import { OPENAI_COMPATIBLE_PREFIX, ANTHROPIC_COMPATIBLE_PREFIX } from "@/shared/constants/providers";
+
+const COMPATIBLE_PROVIDER_ID_PATTERN = new RegExp(
+  `^(?:${OPENAI_COMPATIBLE_PREFIX}(?:chat|responses)-|${ANTHROPIC_COMPATIBLE_PREFIX}(?:cc-)?)[0-9a-f-]+$`,
+  "i"
+);
+
+/**
+ * True when `providerId` matches one of the four generated compatible-
+ * provider connection ID shapes. Rejects plain built-in provider IDs (e.g.
+ * "openai", "anthropic") and unrelated look-alikes (e.g.
+ * "custom-compatible-chat-...").
+ */
+export function isCompatibleProviderConnectionId(providerId: string | null | undefined): boolean {
+  return typeof providerId === "string" && COMPATIBLE_PROVIDER_ID_PATTERN.test(providerId);
+}