[bugfix] Fix double-click required after pasting URL in upload model dialog (#6801)

## Summary
Fixed an issue where users had to click twice to continue after pasting
a URL in the upload model dialog - once to blur the input, then again to
click the button.

## Changes
- **What**: Replaced `UrlInput` with plain `InputText` in
`UploadModelUrlInput` to emit value immediately on input instead of only
on blur
- **Cleanup**: Moved URL cleaning/normalization to the `fetchMetadata`
handler, removed unused `disableValidation` prop from `UrlInput`
component

## Review Focus
- URL normalization logic in `useUploadModelWizard.ts`

🤖 Generated with [Claude Code](https://claude.com/claude-code)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6801-bugfix-Fix-double-click-required-after-pasting-URL-in-upload-model-dialog-2b26d73d3650811881aed0cc064efcc7)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Claude <noreply@anthropic.com>

src/components/common/UrlInput.vue

@@ -35,7 +35,6 @@ import { ValidationState } from '@/utils/validationUtil'
 const props = defineProps<{
   modelValue: string
   validateUrlFn?: (url: string) => Promise<boolean>
-  disableValidation?: boolean
 }>()
 
 const emit = defineEmits<{
@@ -102,8 +101,6 @@ const defaultValidateUrl = async (url: string): Promise<boolean> => {
 }
 
 const validateUrl = async (value: string) => {
-  if (props.disableValidation) return
-
   if (validationState.value === ValidationState.LOADING) return
 
   const url = cleanInput(value)