feat: add VRAM requirement estimation for workflow templates

Add a frontend heuristic that estimates peak VRAM consumption by
detecting model-loading nodes in the workflow graph and summing
approximate memory costs per model category (checkpoints, LoRAs,
ControlNets, VAEs, etc.). The estimate uses only the largest base
model (checkpoint or diffusion_model) since ComfyUI offloads others,
plus all co-resident models and a flat runtime overhead.

Surfaces the estimate in three places:

1. Template publishing wizard (metadata step) — auto-detects VRAM on
   mount using the same graph traversal pattern as custom node
   detection, with a manual GB override input for fine-tuning.

2. Template marketplace cards — displays a VRAM badge in the top-left
   corner of template thumbnails using the existing SquareChip and
   CardTop slot infrastructure.

3. Workflow editor — floating indicator in the bottom-right of the
   graph canvas showing estimated VRAM for the current workflow.

Bumps version to 1.46.0.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/custom/widget/WorkflowTemplateSelectorDialog.vue

@@ -267,6 +267,16 @@
                     />
                   </div>
                 </template>
+                <template v-if="template.vram" #top-left>
+                  <SquareChip
+                    :label="formatSize(template.vram)"
+                    :title="t('templateWorkflows.vramEstimateTooltip')"
+                  >
+                    <template #icon>
+                      <i class="icon-[lucide--cpu] h-3 w-3" />
+                    </template>
+                  </SquareChip>
+                </template>
                 <template #bottom-right>
                   <template v-if="template.tags && template.tags.length > 0">
                     <SquareChip
@@ -387,6 +397,7 @@
 
 <script setup lang="ts">
 import { useAsyncState } from '@vueuse/core'
+import { formatSize } from '@/utils/formatUtil'
 import ProgressSpinner from 'primevue/progressspinner'
 import { computed, onBeforeUnmount, onMounted, provide, ref, watch } from 'vue'
 import { useI18n } from 'vue-i18n'