refactor: remove unused POST /api/v1/utils/markdown endpoint (#24779)

POST /utils/markdown rendered a markdown string to HTML server-side. Its
only frontend wrapper, getHTMLFromMarkdown in src/lib/apis/utils/index.ts,
is dead: nothing imports or calls it, the route is hit by no other code
path, and the path string appears nowhere else in the repo (no direct
fetch, no test, no docs). Markdown is rendered client-side in the UI, so
this endpoint was redundant.

Fully self-contained removal: the endpoint, its MarkdownForm model, the
now-orphaned 'import markdown' in the utils router (used only here), and
the dead getHTMLFromMarkdown wrapper. Nothing else depends on any of them.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/open_webui/routers/utils.py

@@ -3,7 +3,6 @@ from __future__ import annotations
 import logging
 
 import black
-import markdown
 from fastapi import APIRouter, Depends, HTTPException, Request, Response, status
 from open_webui.config import DATA_DIR, ENABLE_ADMIN_EXPORT
 from open_webui.constants import ERROR_MESSAGES
@@ -73,15 +72,6 @@ async def execute_code(request: Request, form_data: CodeForm, user=Depends(get_v
         )
 
 
-class MarkdownForm(BaseModel):
-    md: str
-
-
-@router.post('/markdown')
-async def get_html_from_markdown(form_data: MarkdownForm, user=Depends(get_verified_user)):
-    return {'html': markdown.markdown(form_data.md)}
-
-
 class ChatForm(BaseModel):
     title: str
     messages: list[dict]