refactor(open-sse): B1 consolidate media endpoint URLs into registry

- image/embed/tts/search base URLs derive from media.*Config.baseUrl /
  searchViaChat.endpoint (single source); handlers read PROVIDER_MEDIA.
- ~18 hardcoded endpoints moved: bfl/fal/stability/runway/hf/gemini/
  cloudflare/recraft/sdwebui/comfyui/nanobanana image, voyage embed,
  gemini/openrouter tts, chatSearch endpoints.
- Byte-identical: PROVIDERS 62 + alias 90 baselines, image buildUrl outputs.

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

open-sse/handlers/embeddingProviders/openai.js

@@ -4,7 +4,6 @@ import { PROVIDER_MEDIA } from "../../providers/index.js";
 
 // media-only providers without a registry file keep URL here; rest derive from registry media.embeddingConfig.baseUrl
 const ENDPOINTS = {
-  "voyage-ai": "https://api.voyageai.com/v1/embeddings",
   "jina-ai": "https://api.jina.ai/v1/embeddings",
 };