Feat/onboarding wizard (#2086)

* feat(web): add onboarding wizard for guided bot creation

Implement a full-screen 4-step wizard at /wizard that guides users
through selecting a platform, configuring a bot, choosing an AI engine,
and completing setup. The wizard uses DynamicFormComponent for adapter
and pipeline configuration, embeds BotLogListComponent for real-time
debugging, persists state to localStorage, and integrates with Space
OAuth flow. Also fixes a prompt-editor crash in DynamicFormComponent
when value is undefined.

* feat(wizard): redesign step 0/1 flow, add skip dialog, auto-expand log images

- Step 0: Remove bot name/description fields; auto-derive name from adapter
  label; create disabled bot on confirm; advance to Step 1 automatically
- Step 1: Replace 'Create Bot' with 'Save & Enable Bot'; update adapter
  config and enable bot; disable form fields after saving
- Add skip confirmation AlertDialog with i18n message
- Add LanguageSelector to wizard header
- Move wizard sidebar entry to last position to prevent fallback redirect loop
- Add defaultExpanded prop to BotLogCard; auto-expand entries with images
  in wizard via autoExpandImages prop on BotLogListComponent
- Remove automatic default pipeline creation (write_default_pipeline) from
  backend persistence manager since the wizard now handles pipeline creation
- Update all 4 locale files (en-US, zh-Hans, zh-Hant, ja-JP)

* fix(wizard): hide detailed logs link in wizard, allow re-editing bot config after save

- Add hideDetailedLogsLink prop to BotLogListComponent; pass it in wizard
- Remove isEditing on DynamicFormComponent so form stays editable after save
- Always show save button; label changes to 'Re-save' after first save
- Add resaveBot i18n key to all 4 locale files

* style(wizard): move save button into config card header

* fix(wizard): initialize userInfo/systemInfo so model selector works

The wizard runs outside /home layout, so userInfo was null. This caused
the model-fallback-selector to filter out all Space models, showing an
empty dropdown. Fix by calling initializeUserInfo() and
initializeSystemInfo() before fetching wizard data.

Also:
- Hide log toolbar in wizard via hideToolbar prop on BotLogListComponent
- Add empty state message for bot logs (noLogs i18n key, all 4 locales)

* feat(wizard): redesign AI Engine step with left-right split layout

Before selecting a runner: centered grid of runner cards.
After selecting: left panel shows compact runner list for switching,
right panel shows runner config form with slide-in animations.

Also fix prompt field default: add default value to prompt-editor field
in ai.yaml metadata so the prompt is pre-populated with
'You are a helpful assistant.' instead of being empty.

* feat(pipeline): add default values to ai.yaml runner configs and show_if for n8n auth fields

- Sync default values from default-pipeline-config.json to all runner
  config fields in ai.yaml so wizard forms are pre-populated
- Add show_if conditions to n8n-service-api auth fields so only the
  relevant credentials appear based on selected auth-type
- Fix prompt-editor crash in DynamicFormItemComponent when field.value
  is undefined (Array.isArray guard + fallback)
- Improve wizard Step 2 split layout with fixed column widths,
  independent scroll, ring clipping fix, and mobile responsiveness
- Use key={selected} on DynamicFormComponent to force remount on
  runner switch
- Improve pipeline creation flow: create → fetch defaults → merge AI
  section → update (preserves trigger/safety/output defaults)

* feat(dynamic-form): add systemContext prop with __system.* namespace for show_if conditions

- Add systemContext prop to DynamicFormComponent for injecting external
  variables accessible via __system.* prefix in show_if conditions
- Extract resolveShowIfValue() helper for cleaner field resolution
- Pass { is_wizard: true } from wizard to hide knowledge-bases field
- Remove bot config save toast in wizard (keep inline indicator)

* feat(sidebar): render wizard as standalone item before Home group with fallback redirect fix

* fix(wizard): remove unused setBotDescription to fix lint error

web/src/app/home/components/dynamic-form/DynamicFormItemComponent.tsx

@@ -775,10 +775,18 @@ export default function DynamicFormItemComponent({
         </Select>
       );
 
-    case DynamicFormItemType.PROMPT_EDITOR:
+    case DynamicFormItemType.PROMPT_EDITOR: {
+      // Guard: field.value may be undefined when the form resets or
+      // initialValues haven't propagated yet. Fall back to a default
+      // single system-prompt entry to prevent the .map() crash.
+      const promptItems: { role: string; content: string }[] = Array.isArray(
+        field.value,
+      )
+        ? field.value
+        : [{ role: 'system', content: '' }];
       return (
         <div className="space-y-2">
-          {field.value.map(
+          {promptItems.map(
             (item: { role: string; content: string }, index: number) => (
               <div key={index} className="flex gap-2 items-center">
                 {/* 角色选择 */}
@@ -790,7 +798,7 @@ export default function DynamicFormItemComponent({
                   <Select
                     value={item.role}
                     onValueChange={(value) => {
-                      const newValue = [...field.value];
+                      const newValue = [...(field.value ?? promptItems)];
                       newValue[index] = { ...newValue[index], role: value };
                       field.onChange(newValue);
                     }}
@@ -811,7 +819,7 @@ export default function DynamicFormItemComponent({
                   className="w-[300px]"
                   value={item.content}
                   onChange={(e) => {
-                    const newValue = [...field.value];
+                    const newValue = [...(field.value ?? promptItems)];
                     newValue[index] = {
                       ...newValue[index],
                       content: e.target.value,
@@ -825,7 +833,7 @@ export default function DynamicFormItemComponent({
                     type="button"
                     className="p-2 hover:bg-gray-100 rounded"
                     onClick={() => {
-                      const newValue = field.value.filter(
+                      const newValue = (field.value ?? promptItems).filter(
                         // eslint-disable-next-line @typescript-eslint/no-explicit-any
                         (_: any, i: number) => i !== index,
                       );
@@ -849,13 +857,17 @@ export default function DynamicFormItemComponent({
             type="button"
             variant="outline"
             onClick={() => {
-              field.onChange([...field.value, { role: 'user', content: '' }]);
+              field.onChange([
+                ...(field.value ?? promptItems),
+                { role: 'user', content: '' },
+              ]);
             }}
           >
             {t('common.addRound')}
           </Button>
         </div>
       );
+    }
 
     case DynamicFormItemType.FILE:
       return (