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-web.js

@@ -1,52 +1,32 @@
-
 export default {
-  "id": "perplexity-web",
-  "alias": "perplexity-web",
+  id: "perplexity-web",
+  alias: "perplexity-web",
+  aliases: [
+    "pw",
+  ],
+  uiAlias: "pw",
   display: {
-      "name": "Perplexity Web (Pro/Max)",
-      "icon": "search",
-      "color": "#20808D",
-      "textIcon": "PW",
-      "website": "https://www.perplexity.ai"
+    name: "Perplexity Web (Pro/Max)",
+    icon: "search",
+    color: "#20808D",
+    textIcon: "PW",
+    website: "https://www.perplexity.ai",
   },
   category: "webCookie",
-  uiAlias: "pw",
   authType: "cookie",
   authHint: "Paste your __Secure-next-auth.session-token cookie value from perplexity.ai",
-  aliases: ["pw"],
-  "transport": {
-    "baseUrl": "https://www.perplexity.ai/rest/sse/perplexity_ask",
-    "format": "perplexity-web",
-    "authType": "cookie"
+  transport: {
+    baseUrl: "https://www.perplexity.ai/rest/sse/perplexity_ask",
+    format: "perplexity-web",
+    authType: "cookie",
   },
-  "models": [
-    {
-      "id": "pplx-auto",
-      "name": "Perplexity Auto (Free)"
-    },
-    {
-      "id": "pplx-sonar",
-      "name": "Perplexity Sonar"
-    },
-    {
-      "id": "pplx-gpt",
-      "name": "GPT-5.4 (via Perplexity)"
-    },
-    {
-      "id": "pplx-gemini",
-      "name": "Gemini 3.1 Pro (via Perplexity)"
-    },
-    {
-      "id": "pplx-sonnet",
-      "name": "Claude Sonnet 4.6 (via Perplexity)"
-    },
-    {
-      "id": "pplx-opus",
-      "name": "Claude Opus 4.6 (via Perplexity)"
-    },
-    {
-      "id": "pplx-nemotron",
-      "name": "Nemotron 3 Super (via Perplexity)"
-    }
-  ]
+  models: [
+    { id: "pplx-auto", name: "Perplexity Auto (Free)" },
+    { id: "pplx-sonar", name: "Perplexity Sonar" },
+    { id: "pplx-gpt", name: "GPT-5.4 (via Perplexity)" },
+    { id: "pplx-gemini", name: "Gemini 3.1 Pro (via Perplexity)" },
+    { id: "pplx-sonnet", name: "Claude Sonnet 4.6 (via Perplexity)" },
+    { id: "pplx-opus", name: "Claude Opus 4.6 (via Perplexity)" },
+    { id: "pplx-nemotron", name: "Nemotron 3 Super (via Perplexity)" },
+  ],
 };