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/gitlab.js

@@ -1,17 +1,30 @@
-
 export default {
-  "id": "gitlab",  display: { name: "GitLab Duo", icon: "code", color: "#FC6D26", textIcon: "GL", website: "https://gitlab.com", notice: { signupUrl: "https://gitlab.com" } },
-  category: "oauth",
-  "transport": {
-    "baseUrl": "https://gitlab.com/api/v4/chat/completions",
-      auth: {"combined":true,"header":"Authorization","scheme":"bearer"},
+  id: "gitlab",
+  display: {
+    name: "GitLab Duo",
+    icon: "code",
+    color: "#FC6D26",
+    textIcon: "GL",
+    website: "https://gitlab.com",
+    notice: {
+      signupUrl: "https://gitlab.com",
+    },
+  },
+  category: "oauth",
+  transport: {
+    baseUrl: "https://gitlab.com/api/v4/chat/completions",
+    auth: {
+      combined: true,
+      header: "Authorization",
+      scheme: "bearer",
+    },
+  },
+  oauth: {
+    defaultBaseUrl: "https://gitlab.com",
+    authorizeUrlPath: "/oauth/authorize",
+    tokenUrlPath: "/oauth/token",
+    userInfoUrlPath: "/api/v4/user",
+    scope: "api read_user",
+    codeChallengeMethod: "S256",
   },
-  "oauth": {
-    "defaultBaseUrl": "https://gitlab.com",
-    "authorizeUrlPath": "/oauth/authorize",
-    "tokenUrlPath": "/oauth/token",
-    "userInfoUrlPath": "/api/v4/user",
-    "scope": "api read_user",
-    "codeChallengeMethod": "S256"
-  }
 };