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/mistral.js

@@ -1,43 +1,30 @@
 export default {
-  "id": "mistral",
-  "alias": "mistral",
+  id: "mistral",
+  alias: "mistral",
   display: {
-      "name": "Mistral",
-      "icon": "air",
-      "color": "#FF7000",
-      "textIcon": "MI",
-      "website": "https://mistral.ai",
-      "notice": {
-          "apiKeyUrl": "https://console.mistral.ai/api-keys"
-      }
+    name: "Mistral",
+    icon: "air",
+    color: "#FF7000",
+    textIcon: "MI",
+    website: "https://mistral.ai",
+    notice: {
+      apiKeyUrl: "https://console.mistral.ai/api-keys",
+    },
   },
   category: "apikey",
-  "transport": {
-    "baseUrl": "https://api.mistral.ai/v1/chat/completions",
-    "validateUrl": "https://api.mistral.ai/v1/models",
-    "quirks": { "dropClientMetadata": true }
+  transport: {
+    baseUrl: "https://api.mistral.ai/v1/chat/completions",
+    validateUrl: "https://api.mistral.ai/v1/models",
+    quirks: {
+      dropClientMetadata: true,
+    },
   },
-  media: {
-    serviceKinds: ["llm", "imageToText", "embedding"],
-    embeddingConfig: { baseUrl: "https://api.mistral.ai/v1/embeddings", authType: "apikey", authHeader: "bearer", models: [{ id: "mistral-embed", name: "Mistral Embed", dimensions: 1024 }] }
-  },
-  "models": [
-    {
-      "id": "mistral-large-latest",
-      "name": "Mistral Large 3"
-    },
-    {
-      "id": "codestral-latest",
-      "name": "Codestral"
-    },
-    {
-      "id": "mistral-medium-latest",
-      "name": "Mistral Medium 3"
-    },
-    {
-      "id": "mistral-embed",
-      "name": "Mistral Embed",
-      "type": "embedding"
-    }
-  ]
+  models: [
+    { id: "mistral-large-latest", name: "Mistral Large 3" },
+    { id: "codestral-latest", name: "Codestral" },
+    { id: "mistral-medium-latest", name: "Mistral Medium 3" },
+    { id: "mistral-embed", name: "Mistral Embed", kind: "embedding" },
+  ],
+  serviceKinds: ["llm","imageToText","embedding"],
+  embeddingConfig: { baseUrl: "https://api.mistral.ai/v1/embeddings", authType: "apikey", authHeader: "bearer" },
 };