Bug report — Custom connector URL field auto-capitalizes path

### What happened?

Bug report — Custom connector URL field auto-capitalizes path

Summary: When adding a custom connector, the URL field automatically capitalizes part of the path, breaking the connection.

### What did you expect to happen?

input https://app.yourbi.nl/api/mcp (all lowercase) remains lowercase and not change into https://app.yourbi.nl/API/MCP

### Steps to reproduce

Settings → Connectors → Add → Add custom connector
Enter URL: https://app.yourbi.nl/api/mcp (all lowercase)
Click Add / Connect

Expected: Connector saves with the URL exactly as typed.
Actual: The path is changed to https://app.yourbi.nl/API/MCP. Since the server is case-sensitive, this results in "Connection issue — Couldn't connect to the server."

Workaround tried: Retyping and pasting the URL, both result in the same auto-capitalization.

### Area

MCP Connector (adding/managing servers)

### MCP Server (if applicable)

_No response_

### Error messages or logs

```shell

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### Additional context

_No response_