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/volcengine-ark.js

@@ -1,60 +1,34 @@
-
 export default {
-  "id": "volcengine-ark",
-  "alias": "volcengine-ark",
+  id: "volcengine-ark",
+  alias: "volcengine-ark",
+  aliases: [
+    "ark",
+  ],
+  uiAlias: "ark",
   display: {
-      "name": "Volcengine Ark",
-      "icon": "cloud",
-      "color": "#1677FF",
-      "textIcon": "ARK",
-      "website": "https://ark.cn-beijing.volces.com",
-      "notice": {
-          "apiKeyUrl": "https://console.volcengine.com/ark/region:ark+cn-beijing/apiKey"
-      }
+    name: "Volcengine Ark",
+    icon: "cloud",
+    color: "#1677FF",
+    textIcon: "ARK",
+    website: "https://ark.cn-beijing.volces.com",
+    notice: {
+      apiKeyUrl: "https://console.volcengine.com/ark/region:ark+cn-beijing/apiKey",
+    },
   },
   category: "apikey",
-  uiAlias: "ark",
-  aliases: ["ark"],
-  "transport": {
-    "baseUrl": "https://ark.cn-beijing.volces.com/api/coding/v3/chat/completions",
-    "headers": {}
+  transport: {
+    baseUrl: "https://ark.cn-beijing.volces.com/api/coding/v3/chat/completions",
+    headers: {},
   },
-  "models": [
-    {
-      "id": "Doubao-Seed-2.0-Code",
-      "name": "Doubao-Seed-2.0-Code"
-    },
-    {
-      "id": "Doubao-Seed-2.0-pro",
-      "name": "Doubao-Seed-2.0-pro"
-    },
-    {
-      "id": "Doubao-Seed-2.0-lite",
-      "name": "Doubao-Seed-2.0-lite"
-    },
-    {
-      "id": "Doubao-Seed-Code",
-      "name": "Doubao-Seed-Code"
-    },
-    {
-      "id": "DeepSeek-V4-Flash",
-      "name": "DeepSeek-V4-Flash"
-    },
-    {
-      "id": "DeepSeek-V4-Pro",
-      "name": "DeepSeek-V4-Pro"
-    },
-    {
-      "id": "GLM-5.1",
-      "name": "GLM-5.1"
-    },
-    {
-      "id": "MiniMax-M2.7",
-      "name": "MiniMax-M2.7"
-    },
-    {
-      "id": "Kimi-K2.6",
-      "name": "Kimi-K2.6"
-    }
-  ]
+  models: [
+    { id: "Doubao-Seed-2.0-Code", name: "Doubao-Seed-2.0-Code" },
+    { id: "Doubao-Seed-2.0-pro", name: "Doubao-Seed-2.0-pro" },
+    { id: "Doubao-Seed-2.0-lite", name: "Doubao-Seed-2.0-lite" },
+    { id: "Doubao-Seed-Code", name: "Doubao-Seed-Code" },
+    { id: "DeepSeek-V4-Flash", name: "DeepSeek-V4-Flash" },
+    { id: "DeepSeek-V4-Pro", name: "DeepSeek-V4-Pro" },
+    { id: "GLM-5.1", name: "GLM-5.1" },
+    { id: "MiniMax-M2.7", name: "MiniMax-M2.7" },
+    { id: "Kimi-K2.6", name: "Kimi-K2.6" },
+  ],
 };