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/azure.js

@@ -1,20 +1,20 @@
 export default {
-  "id": "azure",
-  "alias": "azure",
+  id: "azure",
+  alias: "azure",
   display: {
-      "name": "Azure OpenAI",
-      "icon": "cloud",
-      "color": "#0078D4",
-      "textIcon": "AZ",
-      "website": "https://azure.microsoft.com/en-us/products/ai-services/openai-service",
-      "notice": {
-          "apiKeyUrl": "https://portal.azure.com/#view/Microsoft_Azure_ProjectOxford/CognitiveServicesHub/~/OpenAI"
-      }
+    name: "Azure OpenAI",
+    icon: "cloud",
+    color: "#0078D4",
+    textIcon: "AZ",
+    website: "https://azure.microsoft.com/en-us/products/ai-services/openai-service",
+    notice: {
+      apiKeyUrl: "https://portal.azure.com/#view/Microsoft_Azure_ProjectOxford/CognitiveServicesHub/~/OpenAI",
+    },
   },
   category: "apikey",
   hasProviderSpecificData: true,
-  "transport": {
-    "baseUrl": "",
-    "headers": {}
-  }
+  transport: {
+    baseUrl: "",
+    headers: {},
+  },
 };