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/assemblyai.js

@@ -1,45 +1,37 @@
-
 export default {
-  "id": "assemblyai",
-  "alias": "assemblyai",
+  id: "assemblyai",
+  alias: "assemblyai",
+  aliases: [
+    "aai",
+  ],
+  uiAlias: "aai",
   display: {
-      "name": "AssemblyAI",
-      "icon": "record_voice_over",
-      "color": "#0062FF",
-      "textIcon": "AA",
-      "website": "https://assemblyai.com",
-      "notice": {
-          "apiKeyUrl": "https://www.assemblyai.com/app/api-keys"
-      }
+    name: "AssemblyAI",
+    icon: "record_voice_over",
+    color: "#0062FF",
+    textIcon: "AA",
+    website: "https://assemblyai.com",
+    notice: {
+      apiKeyUrl: "https://www.assemblyai.com/app/api-keys",
+    },
   },
   category: "apikey",
-  uiAlias: "aai",
   authType: "apikey",
-  aliases: ["aai"],
-  "transport": {
-    "baseUrl": "https://api.assemblyai.com/v1/audio/transcriptions",
-    "validateUrl": "https://api.assemblyai.com/v1/account"
+  transport: {
+    baseUrl: "https://api.assemblyai.com/v1/audio/transcriptions",
+    validateUrl: "https://api.assemblyai.com/v1/account",
   },
-  media: {
-    serviceKinds: ["stt"],
-    sttConfig: { baseUrl: "https://api.assemblyai.com/v2/transcript", authType: "apikey", authHeader: "authorization", format: "assemblyai", models: [{ id: "best", name: "Best (Nano + Universal)" }, { id: "nano", name: "Nano (Fast)" }] }
+  models: [
+    { id: "universal-3-pro", name: "Universal 3 Pro", params: ["language"], kind: "stt" },
+    { id: "universal-2", name: "Universal 2", params: ["language"], kind: "stt" },
+    { id: "best", name: "Best (Nano + Universal)", kind: "stt" },
+    { id: "nano", name: "Nano (Fast)", kind: "stt" },
+  ],
+  serviceKinds: ["stt"],
+  sttConfig: {
+    baseUrl: "https://api.assemblyai.com/v2/transcript",
+    authType: "apikey",
+    authHeader: "authorization",
+    format: "assemblyai",
   },
-  "models": [
-    {
-      "id": "universal-3-pro",
-      "name": "Universal 3 Pro",
-      "type": "stt",
-      "params": [
-        "language"
-      ]
-    },
-    {
-      "id": "universal-2",
-      "name": "Universal 2",
-      "type": "stt",
-      "params": [
-        "language"
-      ]
-    }
-  ]
 };