[feat] Add Civitai model upload wizard (#6694)

## Summary
Adds a complete model upload workflow that allows users to import models
from Civitai URLs directly into their library.

## Changes
- **Multi-step wizard**: URL input → metadata confirmation → upload
progress
- **Components**: UploadModelDialog, UploadModelUrlInput,
UploadModelConfirmation, UploadModelProgress, UploadModelDialogHeader
- **API integration**: New assetService methods for metadata retrieval
and URL-based uploads
- **Model type management**: useModelTypes composable for fetching and
formatting available model types
- **UX improvements**: Optional validation bypass for UrlInput component
- **Localization**: 26 new i18n strings for the upload workflow

## Review Focus
- Error handling for failed uploads and metadata retrieval
- Model type detection and selection logic
- Dialog state management across multi-step workflow

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6694-feat-Add-Civitai-model-upload-wizard-2ab6d73d36508193b3b1dd67c7cc5a09)
by [Unito](https://www.unito.io)

---------

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

src/platform/assets/components/UploadModelProgress.vue

@@ -0,0 +1,68 @@
+<template>
+  <div class="flex flex-1 flex-col gap-6">
+    <!-- Uploading State -->
+    <div
+      v-if="status === 'uploading'"
+      class="flex flex-1 flex-col items-center justify-center gap-6"
+    >
+      <i
+        class="icon-[lucide--loader-circle] animate-spin text-6xl text-primary"
+      />
+      <div class="text-center">
+        <p class="m-0 text-sm font-bold">
+          {{ $t('assetBrowser.uploadingModel') }}
+        </p>
+      </div>
+    </div>
+
+    <!-- Success State -->
+    <div v-else-if="status === 'success'" class="flex flex-col gap-8">
+      <div class="flex flex-col gap-4">
+        <p class="text-sm text-muted m-0 font-bold">
+          {{ $t('assetBrowser.modelUploaded') }}
+        </p>
+        <p class="text-sm text-muted m-0">
+          {{ $t('assetBrowser.findInLibrary', { type: modelType }) }}
+        </p>
+      </div>
+
+      <div class="flex flex-row items-start p-8 bg-neutral-800 rounded-lg">
+        <div class="flex flex-col justify-center items-start gap-1 flex-1">
+          <p class="text-sm m-0">
+            {{ metadata?.name || metadata?.filename }}
+          </p>
+          <p class="text-sm text-muted m-0">
+            {{ modelType }}
+          </p>
+        </div>
+      </div>
+    </div>
+
+    <!-- Error State -->
+    <div
+      v-else-if="status === 'error'"
+      class="flex flex-1 flex-col items-center justify-center gap-6"
+    >
+      <i class="icon-[lucide--x-circle] text-6xl text-error" />
+      <div class="text-center">
+        <p class="m-0 text-sm font-bold">
+          {{ $t('assetBrowser.uploadFailed') }}
+        </p>
+        <p v-if="error" class="text-sm text-muted mb-0">
+          {{ error }}
+        </p>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import type { AssetMetadata } from '@/platform/assets/schemas/assetSchema'
+
+defineProps<{
+  status: 'idle' | 'uploading' | 'success' | 'error'
+  error?: string
+  metadata: AssetMetadata | null
+  modelType: string | undefined
+}>()
+</script>