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/sdwebui.js

@@ -1,38 +1,19 @@
-
 export default {
-  "id": "sdwebui",
-  "alias": "sdwebui",
+  id: "sdwebui",
+  alias: "sdwebui",
   display: {
-      "name": "SD WebUI",
-      "icon": "brush",
-      "color": "#FF7043",
-      "textIcon": "SD",
-      "website": "https://github.com/AUTOMATIC1111/stable-diffusion-webui"
+    name: "SD WebUI",
+    icon: "brush",
+    color: "#FF7043",
+    textIcon: "SD",
+    website: "https://github.com/AUTOMATIC1111/stable-diffusion-webui",
   },
   category: "apikey",
-  "transport": null,
-  media: {
-    serviceKinds: ["image"],
-    imageConfig: { baseUrl: "http://localhost:7860/sdapi/v1/txt2img" }
-  },
-  "models": [
-    {
-      "id": "stable-diffusion-v1-5",
-      "name": "Stable Diffusion v1.5",
-      "type": "image",
-      "params": [
-        "n",
-        "size"
-      ]
-    },
-    {
-      "id": "sdxl-base-1.0",
-      "name": "SDXL Base 1.0",
-      "type": "image",
-      "params": [
-        "n",
-        "size"
-      ]
-    }
-  ]
+  transport: null,
+  models: [
+    { id: "stable-diffusion-v1-5", name: "Stable Diffusion v1.5", params: ["n","size"], kind: "image" },
+    { id: "sdxl-base-1.0", name: "SDXL Base 1.0", params: ["n","size"], kind: "image" },
+  ],
+  serviceKinds: ["image"],
+  imageConfig: { baseUrl: "http://localhost:7860/sdapi/v1/txt2img" },
 };