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/gemini.js

@@ -3,10 +3,30 @@ import { GOOGLE_OAUTH_CLIENT } from "../shared.js";
 export default {
   "id": "gemini",
   "alias": "gemini",
+  display: {
+      "name": "Gemini",
+      "icon": "diamond",
+      "color": "#4285F4",
+      "textIcon": "GE",
+      "website": "https://ai.google.dev",
+      "notice": {
+          "apiKeyUrl": "https://aistudio.google.com/app/apikey"
+      },
+      "mediaPriority": 1
+  },
+  category: "freeTier",
   "transport": {
     "baseUrl": "https://generativelanguage.googleapis.com/v1beta/models",
     "format": "gemini",
-    ...GOOGLE_OAUTH_CLIENT
+    ...GOOGLE_OAUTH_CLIENT,
+      auth: {"apiKey":{"header":"x-goog-api-key","scheme":"raw"},"oauth":{"header":"Authorization","scheme":"bearer"}},
+  },
+  media: {
+    serviceKinds: ["llm", "embedding", "image", "imageToText", "webSearch", "tts", "stt"],
+    ttsConfig: { baseUrl: "https://generativelanguage.googleapis.com/v1beta/models", authType: "apikey", authHeader: "key", format: "gemini-tts", models: [{ id: "gemini-2.5-flash-preview-tts", name: "Gemini 2.5 Flash TTS" }, { id: "gemini-2.5-pro-preview-tts", name: "Gemini 2.5 Pro TTS" }] },
+    sttConfig: { baseUrl: "https://generativelanguage.googleapis.com/v1beta/models", authType: "apikey", authHeader: "key", format: "gemini-stt", models: [{ id: "gemini-2.5-pro", name: "Gemini 2.5 Pro (Best)" }, { id: "gemini-2.5-flash", name: "Gemini 2.5 Flash" }, { id: "gemini-2.5-flash-lite", name: "Gemini 2.5 Flash Lite (Cheapest)" }, { id: "gemini-2.0-flash", name: "Gemini 2.0 Flash" }] },
+    embeddingConfig: { baseUrl: "https://generativelanguage.googleapis.com/v1beta/models", authType: "apikey", authHeader: "key", models: [{ id: "text-embedding-004", name: "Text Embedding 004", dimensions: 768 }, { id: "embedding-001", name: "Embedding 001", dimensions: 768 }] },
+    searchViaChat: { defaultModel: "gemini-2.5-flash", pricingUrl: "https://ai.google.dev/pricing", freeTier: "Free tier: 15 RPM, 1M tokens/day on gemini-2.5-flash via AI Studio." }
   },
   "models": [
     {
@@ -119,5 +139,5 @@ export default {
         "prompt"
       ]
     }
-  ]
+  ],
 };