refactor(open-sse): registry consolidation + DRY media/oauth/adhoc cleanup

- Single-source registry: oauth clientId/tokenUrl, usage URLs, image/embed
  configs, search defaultModel, codex fixedPort, google token url derive.
- Remove 29 unused OmniRoute providers (registry 100→71); media intact.
- De-adhoc: codex literals → registry format/oauth flags; reasoningInject,
  image/embed openrouter headers + xai bodyFields config-driven.
- Add REGISTRY_TEMPLATE.js + expand PROVIDER_DEFAULTS/schema JSDoc.
- Baselines updated; PROVIDERS 62 + alias 90 byte-for-byte, golden snapshots.

Co-authored-by: Cursor <cursoragent@cursor.com>

open-sse/providers/registry/openai.js

@@ -1,10 +1,30 @@
 export default {
   "id": "openai",
   "alias": "openai",
+  display: {
+      "name": "OpenAI",
+      "icon": "auto_awesome",
+      "color": "#10A37F",
+      "textIcon": "OA",
+      "website": "https://platform.openai.com",
+      "notice": {
+          "apiKeyUrl": "https://platform.openai.com/api-keys"
+      }
+  },
+  category: "apikey",
+  thinkingConfig: {"options":["auto","none","low","medium","high"],"defaultMode":"auto"},
   "transport": {
     "baseUrl": "https://api.openai.com/v1/chat/completions",
     "forceStream": true
   },
+  media: {
+    serviceKinds: ["llm", "embedding", "tts", "stt", "image", "imageToText", "webSearch"],
+    ttsConfig: { baseUrl: "https://api.openai.com/v1/audio/speech", authType: "apikey", authHeader: "bearer", format: "openai", defaultModel: "gpt-4o-mini-tts", models: [{ id: "tts-1", name: "TTS-1" }, { id: "tts-1-hd", name: "TTS-1 HD" }, { id: "gpt-4o-mini-tts", name: "GPT-4o Mini TTS" }] },
+    sttConfig: { baseUrl: "https://api.openai.com/v1/audio/transcriptions", authType: "apikey", authHeader: "bearer", format: "openai", models: [{ id: "whisper-1", name: "Whisper 1" }, { id: "gpt-4o-transcribe", name: "GPT-4o Transcribe" }, { id: "gpt-4o-mini-transcribe", name: "GPT-4o Mini Transcribe" }] },
+    embeddingConfig: { baseUrl: "https://api.openai.com/v1/embeddings", authType: "apikey", authHeader: "bearer", models: [{ id: "text-embedding-3-small", name: "Text Embedding 3 Small", dimensions: 1536 }, { id: "text-embedding-3-large", name: "Text Embedding 3 Large", dimensions: 3072 }, { id: "text-embedding-ada-002", name: "Text Embedding Ada 002", dimensions: 1536 }] },
+    imageConfig: { baseUrl: "https://api.openai.com/v1/images/generations" },
+    searchViaChat: { defaultModel: "gpt-4o-mini", pricingUrl: "https://openai.com/api/pricing" }
+  },
   "models": [
     {
       "id": "gpt-5.4",