feat(providers): declare imageToText serviceKind on major vision providers

The /dashboard/media-providers/imageToText category was empty by design:
imageToText has no backing registry and no catalog entry declared it.
Declare serviceKinds: ["llm", "imageToText"] on the 7 major vision-capable
providers (openai, anthropic, gemini, openrouter, mistral, xai, groq) so the
category lists them and the Modality Bridge ?tab=vision shortcut becomes
reachable from their provider detail pages.

"llm" is declared alongside because ProviderCard treats an EMPTY serviceKinds
as "regular LLM provider" — declaring only imageToText would silently hide the
inline Test button and the playground default (guarded by the new test).

Refs #9760

src/shared/constants/providers/apikey/frontier-labs.ts

@@ -11,6 +11,7 @@ export const APIKEY_PROVIDERS_FRONTIER = {
     color: "#10A37F",
     textIcon: "OA",
     website: "https://platform.openai.com",
+    serviceKinds: ["llm", "imageToText"],
   },
   reka: {
     id: "reka",
@@ -52,6 +53,7 @@ export const APIKEY_PROVIDERS_FRONTIER = {
     color: "#D97757",
     textIcon: "AN",
     website: "https://platform.claude.com",
+    serviceKinds: ["llm", "imageToText"],
   },
   gemini: {
     id: "gemini",
@@ -64,6 +66,7 @@ export const APIKEY_PROVIDERS_FRONTIER = {
     hasFree: true,
     freeNote:
       "Free tier available through Google AI Studio; current per-model quotas and regional limits apply",
+    serviceKinds: ["llm", "imageToText"],
   },
   groq: {
     id: "groq",
@@ -75,6 +78,7 @@ export const APIKEY_PROVIDERS_FRONTIER = {
     website: "https://groq.com",
     hasFree: true,
     freeNote: "Free tier: 30 RPM / 14.4K RPD — no credit card",
+    serviceKinds: ["llm", "imageToText"],
   },
   blackbox: {
     id: "blackbox",
@@ -96,6 +100,7 @@ export const APIKEY_PROVIDERS_FRONTIER = {
     color: "#1DA1F2",
     textIcon: "XA",
     website: "https://x.ai",
+    serviceKinds: ["llm", "imageToText"],
   },
   mistral: {
     id: "mistral",
@@ -107,6 +112,7 @@ export const APIKEY_PROVIDERS_FRONTIER = {
     website: "https://mistral.ai",
     hasFree: true,
     freeNote: "Free Experiment tier: rate-limited access to all models, no credit card required",
+    serviceKinds: ["llm", "imageToText"],
   },
   perplexity: {
     id: "perplexity",

src/shared/constants/providers/apikey/gateways.ts

@@ -82,6 +82,7 @@ export const APIKEY_PROVIDERS_GATEWAYS = {
     website: "https://openrouter.ai",
     hasFree: true,
     freeNote: "Free models at $0/token with :free suffix - 20 RPM / 200 RPD",
+    serviceKinds: ["llm", "imageToText"],
   },
   requesty: {
     id: "requesty",

tests/unit/imagetotext-service-kinds.test.ts

@@ -0,0 +1,42 @@
+import { test } from "node:test";
+import assert from "node:assert/strict";
+
+import { AI_PROVIDERS } from "../../src/shared/constants/providers.ts";
+import { resolveProviderServiceKinds } from "../../open-sse/config/mediaServiceKinds.ts";
+
+/**
+ * The Image-to-Text category (/dashboard/media-providers/imageToText) fills from
+ * providers whose resolved serviceKinds include "imageToText". It has no backing
+ * registry, so major vision-capable providers must declare it explicitly.
+ */
+const IMAGE_TO_TEXT_PROVIDERS = [
+  "openai",
+  "anthropic",
+  "gemini",
+  "openrouter",
+  "mistral",
+  "xai",
+  "groq",
+] as const;
+
+test("major vision providers declare the imageToText serviceKind", () => {
+  for (const id of IMAGE_TO_TEXT_PROVIDERS) {
+    const provider = AI_PROVIDERS[id] as { serviceKinds?: string[] } | undefined;
+    assert.ok(provider, `provider "${id}" missing from AI_PROVIDERS`);
+    const kinds = resolveProviderServiceKinds(id, provider.serviceKinds);
+    assert.ok(kinds.includes("imageToText"), `"${id}" must resolve the imageToText serviceKind`);
+  }
+});
+
+test("declaring imageToText keeps the llm kind (inline Test button + playground default)", () => {
+  // ProviderCard treats an EMPTY serviceKinds as "regular LLM provider"; once a
+  // provider declares any kind, "llm" must be declared too or the Test button
+  // and the playground default silently disappear.
+  for (const id of IMAGE_TO_TEXT_PROVIDERS) {
+    const provider = AI_PROVIDERS[id] as { serviceKinds?: string[] };
+    assert.ok(
+      (provider.serviceKinds ?? []).includes("llm"),
+      `"${id}" declares serviceKinds without "llm" — this hides the inline Test button`
+    );
+  }
+});