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/perplexity.js

@@ -1,37 +1,34 @@
-
 export default {
-  "id": "perplexity",
-  "alias": "perplexity",
+  id: "perplexity",
+  alias: "perplexity",
+  aliases: [
+    "pplx",
+  ],
+  uiAlias: "pplx",
   display: {
-      "name": "Perplexity",
-      "icon": "search",
-      "color": "#20808D",
-      "textIcon": "PP",
-      "website": "https://www.perplexity.ai",
-      "notice": {
-          "apiKeyUrl": "https://www.perplexity.ai/settings/api"
-      }
+    name: "Perplexity",
+    icon: "search",
+    color: "#20808D",
+    textIcon: "PP",
+    website: "https://www.perplexity.ai",
+    notice: {
+      apiKeyUrl: "https://www.perplexity.ai/settings/api",
+    },
   },
   category: "apikey",
-  uiAlias: "pplx",
   authType: "apikey",
-  aliases: ["pplx"],
-  "transport": {
-    "baseUrl": "https://api.perplexity.ai/chat/completions",
-    "validateUrl": "https://api.perplexity.ai/models"
+  transport: {
+    baseUrl: "https://api.perplexity.ai/chat/completions",
+    validateUrl: "https://api.perplexity.ai/models",
   },
-  media: {
-    serviceKinds: ["llm", "webSearch"],
-    searchViaChat: { defaultModel: "sonar", endpoint: "https://api.perplexity.ai/chat/completions", pricingUrl: "https://docs.perplexity.ai/guides/pricing" }
+  models: [
+    { id: "sonar-pro", name: "Sonar Pro" },
+    { id: "sonar", name: "Sonar" },
+  ],
+  serviceKinds: ["llm","webSearch"],
+  searchViaChat: {
+    defaultModel: "sonar",
+    endpoint: "https://api.perplexity.ai/chat/completions",
+    pricingUrl: "https://docs.perplexity.ai/guides/pricing",
   },
-  "models": [
-    {
-      "id": "sonar-pro",
-      "name": "Sonar Pro"
-    },
-    {
-      "id": "sonar",
-      "name": "Sonar"
-    }
-  ]
 };