feat: add upgrade modal for model upload when private models disabled (#7124)

## Summary
Adds a dedicated upgrade modal that appears when users without private
models access try to upload models, providing a clear path to upgrade
their subscription.

## Changes
- **New upgrade modal**: Created `UploadModelUpgradeModal` with
dedicated body, header, and footer components
- **Conditional rendering**: Modified `AssetBrowserModal` to show
upgrade modal when `privateModelsEnabled` flag is false
- **Subscription integration**: Connected upgrade flow to existing
subscription system via `showSubscriptionDialog()`
- **Localization**: Added localization keys for upgrade messaging

## Review Focus
- Conditional logic in `AssetBrowserModal.handleUploadClick()` based on
feature flags
- Component naming consistency (all upgrade-related components prefixed
with `UploadModelUpgrade`)
- Footer component refactoring maintains existing upload wizard behavior

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

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7124-feat-add-upgrade-modal-for-model-upload-when-private-models-disabled-2be6d73d36508147b72eea8a1d6ab772)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Alexander Brown <drjkl@comfy.org>

src/platform/assets/components/UploadModelUpgradeModal.vue

@@ -0,0 +1,30 @@
+<template>
+  <div
+    class="flex flex-col justify-between gap-10 p-4 border-t border-border-default w-auto max-w-[min(500px,90vw)]"
+  >
+    <UploadModelUpgradeModalBody />
+
+    <UploadModelUpgradeModalFooter
+      @close="handleClose"
+      @subscribe="handleSubscribe"
+    />
+  </div>
+</template>
+
+<script setup lang="ts">
+import UploadModelUpgradeModalBody from '@/platform/assets/components/UploadModelUpgradeModalBody.vue'
+import UploadModelUpgradeModalFooter from '@/platform/assets/components/UploadModelUpgradeModalFooter.vue'
+import { useSubscription } from '@/platform/cloud/subscription/composables/useSubscription'
+import { useDialogStore } from '@/stores/dialogStore'
+
+const dialogStore = useDialogStore()
+const { showSubscriptionDialog } = useSubscription()
+
+function handleClose() {
+  dialogStore.closeDialog({ key: 'upload-model-upgrade' })
+}
+
+function handleSubscribe() {
+  showSubscriptionDialog()
+}
+</script>