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/openrouter.js

@@ -1,6 +1,19 @@
+
 export default {
   "id": "openrouter",
   "alias": "openrouter",
+  display: {
+      "name": "OpenRouter",
+      "icon": "router",
+      "color": "#F97316",
+      "textIcon": "OR",
+      "website": "https://openrouter.ai",
+      "notice": {
+          "text": "Free tier: 27+ free models, no credit card needed, 200 req/day. After  0 credit: 1,000 req/day.",
+          "apiKeyUrl": "https://openrouter.ai/settings/keys"
+      }
+  },
+  category: "freeTier",
   "transport": {
     "baseUrl": "https://openrouter.ai/api/v1/chat/completions",
     "headers": {
@@ -8,6 +21,13 @@ export default {
       "X-Title": "Endpoint Proxy"
     }
   },
+  media: {
+    serviceKinds: ["llm", "embedding", "tts", "imageToText"],
+    embeddingConfig: { baseUrl: "https://openrouter.ai/api/v1/embeddings", authType: "apikey", authHeader: "bearer", headers: { "HTTP-Referer": "https://endpoint-proxy.local", "X-Title": "Endpoint Proxy" }, models: [{ id: "openai/text-embedding-3-small", name: "Text Embedding 3 Small (OpenRouter)", dimensions: 1536 }, { id: "openai/text-embedding-3-large", name: "Text Embedding 3 Large (OpenRouter)", dimensions: 3072 }, { id: "openai/text-embedding-ada-002", name: "Text Embedding Ada 002 (OpenRouter)", dimensions: 1536 }] },
+    modelsFetcher: { url: "https://openrouter.ai/api/v1/models", type: "openrouter-free" },
+    imageConfig: { baseUrl: "https://openrouter.ai/api/v1/images/generations", headers: { "HTTP-Referer": "https://endpoint-proxy.local", "X-Title": "Endpoint Proxy" } },
+    passthroughModels: true
+  },
   "models": [
     {
       "id": "openai/text-embedding-3-large",