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/stability-ai.js

@@ -1,67 +1,30 @@
-
 export default {
-  "id": "stability-ai",
-  "alias": "stability-ai",
+  id: "stability-ai",
+  alias: "stability-ai",
+  aliases: [
+    "stability",
+  ],
+  uiAlias: "stability",
   display: {
-      "name": "Stability AI",
-      "icon": "image",
-      "color": "#8B5CF6",
-      "textIcon": "SA",
-      "website": "https://stability.ai",
-      "notice": {
-          "apiKeyUrl": "https://platform.stability.ai/account/keys"
-      }
+    name: "Stability AI",
+    icon: "image",
+    color: "#8B5CF6",
+    textIcon: "SA",
+    website: "https://stability.ai",
+    notice: {
+      apiKeyUrl: "https://platform.stability.ai/account/keys",
+    },
   },
   category: "apikey",
-  uiAlias: "stability",
   authType: "apikey",
-  aliases: ["stability"],
-  "transport": null,
-  media: {
-    serviceKinds: ["image"],
-    imageConfig: { baseUrl: "https://api.stability.ai/v2beta/stable-image/generate" }
-  },
-  "models": [
-    {
-      "id": "stable-image-ultra",
-      "name": "Stable Image Ultra",
-      "type": "image",
-      "params": [
-        "size"
-      ]
-    },
-    {
-      "id": "stable-image-core",
-      "name": "Stable Image Core",
-      "type": "image",
-      "params": [
-        "size",
-        "style"
-      ]
-    },
-    {
-      "id": "sd3.5-large",
-      "name": "Stable Diffusion 3.5 Large",
-      "type": "image",
-      "params": [
-        "size"
-      ]
-    },
-    {
-      "id": "sd3.5-large-turbo",
-      "name": "Stable Diffusion 3.5 Large Turbo",
-      "type": "image",
-      "params": [
-        "size"
-      ]
-    },
-    {
-      "id": "sd3.5-medium",
-      "name": "Stable Diffusion 3.5 Medium",
-      "type": "image",
-      "params": [
-        "size"
-      ]
-    }
-  ]
+  transport: null,
+  models: [
+    { id: "stable-image-ultra", name: "Stable Image Ultra", params: ["size"], kind: "image" },
+    { id: "stable-image-core", name: "Stable Image Core", params: ["size","style"], kind: "image" },
+    { id: "sd3.5-large", name: "Stable Diffusion 3.5 Large", params: ["size"], kind: "image" },
+    { id: "sd3.5-large-turbo", name: "Stable Diffusion 3.5 Large Turbo", params: ["size"], kind: "image" },
+    { id: "sd3.5-medium", name: "Stable Diffusion 3.5 Medium", params: ["size"], kind: "image" },
+  ],
+  serviceKinds: ["image"],
+  imageConfig: { baseUrl: "https://api.stability.ai/v2beta/stable-image/generate" },
 };