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/glm.js

@@ -4,29 +4,41 @@ export default {
   id: "glm",
   alias: "glm",
   display: {
-    "name": "GLM Coding",
-    "icon": "code",
-    "color": "#2563EB",
-    "textIcon": "GL",
-    "website": "https://open.bigmodel.cn",
-    "notice": {
-      "apiKeyUrl": "https://open.bigmodel.cn/usercenter/apikeys"
-    }
+    name: "GLM Coding",
+    icon: "code",
+    color: "#2563EB",
+    textIcon: "GL",
+    website: "https://open.bigmodel.cn",
+    notice: {
+      apiKeyUrl: "https://open.bigmodel.cn/usercenter/apikeys",
+    },
   },
   category: "apikey",
   transport: {
     baseUrl: "https://api.z.ai/api/anthropic/v1/messages",
     format: "claude",
     urlSuffix: "?beta=true",
-    headers: { ...CLAUDE_API_HEADERS },
-    auth: { "combined": true, "header": "x-api-key", "scheme": "raw" },
-    usage: { url: "https://api.z.ai/api/monitor/usage/quota/limit" },
+    headers: {
+      "Anthropic-Version": "2023-06-01",
+      "Anthropic-Beta": "claude-code-20250219,interleaved-thinking-2025-05-14",
+    },
+    auth: {
+      combined: true,
+      header: "x-api-key",
+      scheme: "raw",
+    },
+    usage: {
+      url: "https://api.z.ai/api/monitor/usage/quota/limit",
+    },
   },
   models: [
     { id: "glm-5.1", name: "GLM 5.1" },
     { id: "glm-5", name: "GLM 5" },
     { id: "glm-4.7", name: "GLM 4.7" },
-    { id: "glm-4.6v", name: "GLM 4.6V (Vision)" }
+    { id: "glm-4.6v", name: "GLM 4.6V (Vision)" },
   ],
-  features: { "usage": true, "usageApikey": true },
+  features: {
+    usage: true,
+    usageApikey: true,
+  },
 };