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/lora-cycler/LoraCyclerSettingsView.vue

@@ -13,7 +13,9 @@
           @click="handleOpenSelector"
         >
           <span class="progress-label">{{ isWorkflowExecuting ? 'Using LoRA:' : 'Next LoRA:' }}</span>
-          <span class="progress-name clickable" :class="{ disabled: isPauseDisabled }" :title="currentLoraFilename">
+          <span class="progress-name clickable" 
+                :class="{ disabled: isPauseDisabled, 'no-lora': isNoLora }" 
+                :title="currentLoraFilename">
             {{ currentLoraName || 'None' }}
             <svg class="selector-icon" viewBox="0 0 24 24" fill="currentColor">
               <path d="M7 10l5 5 5-5z"/>
@@ -160,6 +162,27 @@
         />
       </div>
     </div>
+
+    <!-- Include No LoRA Toggle -->
+    <div class="setting-section">
+      <div class="section-header-with-toggle">
+        <label class="setting-label">
+          Add "No LoRA" step
+        </label>
+        <button
+          type="button"
+          class="toggle-switch"
+          :class="{ 'toggle-switch--active': includeNoLora }"
+          @click="$emit('update:includeNoLora', !includeNoLora)"
+          role="switch"
+          :aria-checked="includeNoLora"
+          title="Add an iteration without LoRA for comparison"
+        >
+          <span class="toggle-switch__track"></span>
+          <span class="toggle-switch__thumb"></span>
+        </button>
+      </div>
+    </div>
   </div>
 </template>
 
@@ -182,6 +205,8 @@ const props = defineProps<{
   isPauseDisabled: boolean
   isWorkflowExecuting: boolean
   executingRepeatStep: number
+  includeNoLora: boolean
+  isNoLora?: boolean
 }>()
 
 const emit = defineEmits<{
@@ -190,6 +215,7 @@ const emit = defineEmits<{
   'update:clipStrength': [value: number]
   'update:useCustomClipRange': [value: boolean]
   'update:repeatCount': [value: number]
+  'update:includeNoLora': [value: boolean]
   'toggle-pause': []
   'reset-index': []
   'open-lora-selector': []
@@ -346,6 +372,16 @@ const onRepeatBlur = (event: Event) => {
   color: rgba(191, 219, 254, 1);
 }
 
+.progress-name.no-lora {
+  font-style: italic;
+  color: rgba(226, 232, 240, 0.6);
+}
+
+.progress-name.clickable.no-lora:hover:not(.disabled) {
+  background: rgba(160, 174, 192, 0.2);
+  color: rgba(226, 232, 240, 0.8);
+}
+
 .progress-name.clickable.disabled {
   cursor: not-allowed;
   opacity: 0.5;