refactor(registry): B2 migrate to LiteLLM-style schema — unified models[] with kind field

- 71 registry files: flat `media.*Config.models` → `models[]` with `kind` field
- `media` wrapper removed → serviceKinds, *Config fields promoted top-level
- `type` field renamed to `kind` (llm/image/tts/stt/embedding/embedding/video/music)
- providers/index.js: PROVIDER_MEDIA now built from flat top-level media fields
- shared/constants/providers.js: buildProviderEntry reads flat top-level media fields
- route /v1/models: modelKind() uses kind||type; removed subConfig merge block
- models/info route: removed sub-config fallback lookup (all models in PROVIDER_MODELS)
- ttsProviders/index.js: synthesizeViaConfig reads tts models from PROVIDER_MODELS
- test-models route, helpers.js, validate route: kind||type compat
- Baselines: PROVIDERS 62/62 ✅, Alias 90/90 ✅

Co-authored-by: Cursor <cursoragent@cursor.com>

open-sse/providers/registry/vertex-partner.js

@@ -1,39 +1,28 @@
-
 export default {
-  "id": "vertex-partner",
-  "alias": "vertex-partner",
+  id: "vertex-partner",
+  alias: "vertex-partner",
+  aliases: [
+    "vxp",
+  ],
+  uiAlias: "vxp",
   display: {
-      "name": "Vertex Partner",
-      "icon": "cloud",
-      "color": "#34A853",
-      "textIcon": "VP",
-      "website": "https://cloud.google.com/vertex-ai/generative-ai/docs/partner-models/use-partner-models",
-      "notice": {
-          "apiKeyUrl": "https://console.cloud.google.com/iam-admin/serviceaccounts"
-      }
+    name: "Vertex Partner",
+    icon: "cloud",
+    color: "#34A853",
+    textIcon: "VP",
+    website: "https://cloud.google.com/vertex-ai/generative-ai/docs/partner-models/use-partner-models",
+    notice: {
+      apiKeyUrl: "https://console.cloud.google.com/iam-admin/serviceaccounts",
+    },
   },
   category: "apikey",
-  uiAlias: "vxp",
-  aliases: ["vxp"],
-  "transport": {
-    "baseUrl": "https://aiplatform.googleapis.com"
+  transport: {
+    baseUrl: "https://aiplatform.googleapis.com",
   },
-  "models": [
-    {
-      "id": "deepseek-ai/deepseek-v3.2-maas",
-      "name": "DeepSeek V3.2 (Vertex)"
-    },
-    {
-      "id": "qwen/qwen3-next-80b-a3b-thinking-maas",
-      "name": "Qwen3 Next 80B Thinking (Vertex)"
-    },
-    {
-      "id": "qwen/qwen3-next-80b-a3b-instruct-maas",
-      "name": "Qwen3 Next 80B Instruct (Vertex)"
-    },
-    {
-      "id": "zai-org/glm-5-maas",
-      "name": "GLM-5 (Vertex)"
-    }
-  ]
+  models: [
+    { id: "deepseek-ai/deepseek-v3.2-maas", name: "DeepSeek V3.2 (Vertex)" },
+    { id: "qwen/qwen3-next-80b-a3b-thinking-maas", name: "Qwen3 Next 80B Thinking (Vertex)" },
+    { id: "qwen/qwen3-next-80b-a3b-instruct-maas", name: "Qwen3 Next 80B Instruct (Vertex)" },
+    { id: "zai-org/glm-5-maas", name: "GLM-5 (Vertex)" },
+  ],
 };