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/azure.js

@@ -1,6 +1,18 @@
 export default {
   "id": "azure",
   "alias": "azure",
+  display: {
+      "name": "Azure OpenAI",
+      "icon": "cloud",
+      "color": "#0078D4",
+      "textIcon": "AZ",
+      "website": "https://azure.microsoft.com/en-us/products/ai-services/openai-service",
+      "notice": {
+          "apiKeyUrl": "https://portal.azure.com/#view/Microsoft_Azure_ProjectOxford/CognitiveServicesHub/~/OpenAI"
+      }
+  },
+  category: "apikey",
+  hasProviderSpecificData: true,
   "transport": {
     "baseUrl": "",
     "headers": {}