refactor: move No LoRA feature from LoRA Pool to Lora Cycler widget

Move the 'empty/no LoRA' cycling functionality from the LoRA Pool node
to the Lora Cycler widget for cleaner architecture:

Frontend changes:
- Add include_no_lora field to CyclerConfig interface
- Add includeNoLora state and logic to useLoraCyclerState composable
- Add toggle UI in LoraCyclerSettingsView with special styling
- Show 'No LoRA' entry in LoraListModal when enabled
- Update LoraCyclerWidget to integrate new logic

Backend changes:
- lora_cycler.py reads include_no_lora from config
- Calculate effective_total_count (actual count + 1 when enabled)
- Return empty lora_stack when on No LoRA position
- Return actual LoRA count in total_count (not effective count)

Reverted files to pre-PR state:
- lora_loader.py, lora_pool.py, lora_randomizer.py, lora_stacker.py
- lora_routes.py, lora_service.py
- LoraPoolWidget.vue and related files

Related to PR #861

Co-authored-by: dogatech <dogatech@dogatech.home>

vue-widgets/src/components/LoraPoolWidget.vue

@@ -10,7 +10,6 @@
       :exclude-folders="state.excludeFolders.value"
       :no-credit-required="state.noCreditRequired.value"
       :allow-selling="state.allowSelling.value"
-      :include-empty-lora="state.includeEmptyLora.value"
       :preview-items="state.previewItems.value"
       :match-count="state.matchCount.value"
       :is-loading="state.isLoading.value"
@@ -19,7 +18,6 @@
       @update:exclude-folders="state.excludeFolders.value = $event"
       @update:no-credit-required="state.noCreditRequired.value = $event"
       @update:allow-selling="state.allowSelling.value = $event"
-      @update:include-empty-lora="state.includeEmptyLora.value = $event"
       @refresh="state.refreshPreview"
     />