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/anthropic.js

@@ -4,27 +4,28 @@ export default {
   id: "anthropic",
   alias: "anthropic",
   display: {
-      "name": "Anthropic",
-      "icon": "smart_toy",
-      "color": "#D97757",
-      "textIcon": "AN",
-      "website": "https://console.anthropic.com",
-      "notice": {
-          "apiKeyUrl": "https://console.anthropic.com/settings/keys"
-      }
+    name: "Anthropic",
+    icon: "smart_toy",
+    color: "#D97757",
+    textIcon: "AN",
+    website: "https://console.anthropic.com",
+    notice: {
+      apiKeyUrl: "https://console.anthropic.com/settings/keys",
+    },
   },
   category: "apikey",
   transport: {
     baseUrl: "https://api.anthropic.com/v1/messages",
     format: "claude",
-    headers: { ...CLAUDE_API_HEADERS }
-  },
-  media: {
-    serviceKinds: ["llm", "imageToText"]
+    headers: {
+      "Anthropic-Version": "2023-06-01",
+      "Anthropic-Beta": "claude-code-20250219,interleaved-thinking-2025-05-14",
+    },
   },
   models: [
     { id: "claude-sonnet-4-20250514", name: "Claude Sonnet 4" },
     { id: "claude-opus-4-20250514", name: "Claude Opus 4" },
-    { id: "claude-3-5-sonnet-20241022", name: "Claude 3.5 Sonnet" }
-  ]
+    { id: "claude-3-5-sonnet-20241022", name: "Claude 3.5 Sonnet" },
+  ],
+  serviceKinds: ["llm","imageToText"],
 };