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/composables/useLoraPoolState.ts

@@ -24,7 +24,6 @@ export function useLoraPoolState(widget: ComponentWidget<LoraPoolConfig>) {
   const excludeFolders = ref<string[]>([])
   const noCreditRequired = ref(false)
   const allowSelling = ref(false)
-  const includeEmptyLora = ref(false)
 
   // Available options from API
   const availableBaseModels = ref<BaseModelOption[]>([])
@@ -53,8 +52,7 @@ export function useLoraPoolState(widget: ComponentWidget<LoraPoolConfig>) {
         license: {
           noCreditRequired: noCreditRequired.value,
           allowSelling: allowSelling.value
-        },
-        includeEmptyLora: includeEmptyLora.value
+        }
       },
       preview: {
         matchCount: matchCount.value,
@@ -96,7 +94,6 @@ export function useLoraPoolState(widget: ComponentWidget<LoraPoolConfig>) {
       updateIfChanged(excludeFolders, filters.folders?.exclude || [])
       updateIfChanged(noCreditRequired, filters.license?.noCreditRequired ?? false)
       updateIfChanged(allowSelling, filters.license?.allowSelling ?? false)
-      updateIfChanged(includeEmptyLora, filters.includeEmptyLora ?? false)
 
       // matchCount doesn't trigger watchers, so direct assignment is fine
       matchCount.value = preview?.matchCount || 0
@@ -128,7 +125,6 @@ export function useLoraPoolState(widget: ComponentWidget<LoraPoolConfig>) {
       foldersExclude: excludeFolders.value,
       noCreditRequired: noCreditRequired.value || undefined,
       allowSelling: allowSelling.value || undefined,
-      includeEmptyLora: includeEmptyLora.value || undefined,
       pageSize: 6
     })
 
@@ -154,8 +150,7 @@ export function useLoraPoolState(widget: ComponentWidget<LoraPoolConfig>) {
     includeFolders,
     excludeFolders,
     noCreditRequired,
-    allowSelling,
-    includeEmptyLora
+    allowSelling
   ], onFilterChange, { deep: true })
 
   return {
@@ -167,7 +162,6 @@ export function useLoraPoolState(widget: ComponentWidget<LoraPoolConfig>) {
     excludeFolders,
     noCreditRequired,
     allowSelling,
-    includeEmptyLora,
 
     // Available options
     availableBaseModels,