feat: custom OpenAI-compatible endpoint as a first-class provider (vision + context from /models)

src/server/settings-body.ts

@@ -387,7 +387,9 @@ export function parseDictationSettingsBody(body: unknown): SettingsBodyResult<Di
 }
 
 /** The section→parser map for PUT /api/settings/[section] (the route also
- *  carries the special prompts sub-resource). */
+ *  carries the special prompts sub-resource). The custom endpoint is NOT a
+ *  section here — it is one more provider in the Keys list, connected through
+ *  POST /api/custom-provider (base URL + key + discovery in one action). */
 export const SETTINGS_SECTIONS = {
 	general: parseGeneralSettingsBody,
 	chat: parseSettingsBody,