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/nanobanana.js

@@ -1,47 +1,33 @@
-
 export default {
-  "id": "nanobanana",
-  "alias": "nanobanana",
+  id: "nanobanana",
+  alias: "nanobanana",
+  aliases: [
+    "nb",
+  ],
+  uiAlias: "nb",
   display: {
-      "name": "NanoBanana API",
-      "icon": "extension",
-      "color": "#FFD700",
-      "textIcon": "🍌",
-      "website": "https://nanobananaapi.ai",
-      "notice": {
-          "text": "3rd-party proxy for Google Nano Banana (Gemini 2.5/3 Flash Image). For official, use Gemini provider.",
-          "apiKeyUrl": "https://nanobananaapi.ai/dashboard"
-      }
+    name: "NanoBanana API",
+    icon: "extension",
+    color: "#FFD700",
+    textIcon: "🍌",
+    website: "https://nanobananaapi.ai",
+    notice: {
+      text: "3rd-party proxy for Google Nano Banana (Gemini 2.5/3 Flash Image). For official, use Gemini provider.",
+      apiKeyUrl: "https://nanobananaapi.ai/dashboard",
+    },
   },
   category: "apikey",
-  uiAlias: "nb",
-  aliases: ["nb"],
-  "transport": {
-    "baseUrl": "https://api.nanobananaapi.ai/v1/chat/completions",
-    "validateUrl": "https://api.nanobananaapi.ai/v1/models"
+  transport: {
+    baseUrl: "https://api.nanobananaapi.ai/v1/chat/completions",
+    validateUrl: "https://api.nanobananaapi.ai/v1/models",
   },
-  media: {
-    serviceKinds: ["llm", "image"],
-    imageConfig: { baseUrl: "https://api.nanobananaapi.ai/api/v1/nanobanana/generate", pollUrl: "https://api.nanobananaapi.ai/api/v1/nanobanana/record-info" }
+  models: [
+    { id: "nanobanana-flash", name: "NanoBanana Flash", params: ["n","size"], kind: "image" },
+    { id: "nanobanana-pro", name: "NanoBanana Pro", params: ["n","size"], kind: "image" },
+  ],
+  serviceKinds: ["llm","image"],
+  imageConfig: {
+    baseUrl: "https://api.nanobananaapi.ai/api/v1/nanobanana/generate",
+    pollUrl: "https://api.nanobananaapi.ai/api/v1/nanobanana/record-info",
   },
-  "models": [
-    {
-      "id": "nanobanana-flash",
-      "name": "NanoBanana Flash",
-      "type": "image",
-      "params": [
-        "n",
-        "size"
-      ]
-    },
-    {
-      "id": "nanobanana-pro",
-      "name": "NanoBanana Pro",
-      "type": "image",
-      "params": [
-        "n",
-        "size"
-      ]
-    }
-  ]
 };