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

src/langbot/templates/metadata/pipeline/ai.yaml

@@ -74,6 +74,10 @@ stages:
         type: integer
         required: true
         default: 10
+        show_if:
+          field: __system.is_wizard
+          operator: neq
+          value: true
       - name: prompt
         label:
           en_US: Prompt
@@ -83,6 +87,9 @@ stages:
           zh_Hans: 除非您了解消息结构，否则请只使用 system 单提示词
         type: prompt-editor
         required: true
+        default:
+          - role: system
+            content: "You are a helpful assistant."
       - name: knowledge-bases
         label:
           en_US: Knowledge Bases
@@ -93,6 +100,10 @@ stages:
         type: knowledge-base-multi-selector
         required: false
         default: []
+        show_if:
+          field: __system.is_wizard
+          operator: neq
+          value: true
   - name: tbox-app-api
     label:
       en_US: Tbox App API
@@ -107,12 +118,14 @@ stages:
           zh_Hans: API 密钥
         type: string
         required: true
+        default: ''
       - name: app-id
         label:
           en_US: App ID
           zh_Hans: 应用 ID
         type: string
         required: true
+        default: ''
   - name: dify-service-api
     label:
       en_US: Dify Service API
@@ -127,6 +140,7 @@ stages:
           zh_Hans: 基础 URL
         type: string
         required: true
+        default: 'https://api.dify.ai/v1'
       - name: base-prompt
         label:
           en_US: Base PROMPT
@@ -163,6 +177,7 @@ stages:
           zh_Hans: API 密钥
         type: string
         required: true
+        default: 'your-api-key'
   - name: dashscope-app-api
     label:
       en_US: Aliyun Dashscope App API
@@ -193,12 +208,14 @@ stages:
           zh_Hans: API 密钥
         type: string
         required: true
+        default: 'your-api-key'
       - name: app-id
         label:
           en_US: App ID
           zh_Hans: 应用 ID
         type: string
         required: true
+        default: 'your-app-id'
       - name: references_quote
         label:
           en_US: References Quote
@@ -226,6 +243,7 @@ stages:
           zh_Hans: n8n 工作流的 webhook URL
         type: string
         required: true
+        default: 'http://your-n8n-webhook-url'
       - name: auth-type
         label:
           en_US: Authentication Type
@@ -263,6 +281,10 @@ stages:
         type: string
         required: false
         default: ''
+        show_if:
+          field: auth-type
+          operator: eq
+          value: 'basic'
       - name: basic-password
         label:
           en_US: Password
@@ -273,6 +295,10 @@ stages:
         type: string
         required: false
         default: ''
+        show_if:
+          field: auth-type
+          operator: eq
+          value: 'basic'
       - name: jwt-secret
         label:
           en_US: Secret
@@ -283,6 +309,10 @@ stages:
         type: string
         required: false
         default: ''
+        show_if:
+          field: auth-type
+          operator: eq
+          value: 'jwt'
       - name: jwt-algorithm
         label:
           en_US: Algorithm
@@ -293,6 +323,10 @@ stages:
         type: string
         required: false
         default: 'HS256'
+        show_if:
+          field: auth-type
+          operator: eq
+          value: 'jwt'
       - name: header-name
         label:
           en_US: Header Name
@@ -303,6 +337,10 @@ stages:
         type: string
         required: false
         default: ''
+        show_if:
+          field: auth-type
+          operator: eq
+          value: 'header'
       - name: header-value
         label:
           en_US: Header Value
@@ -313,6 +351,10 @@ stages:
         type: string
         required: false
         default: ''
+        show_if:
+          field: auth-type
+          operator: eq
+          value: 'header'
       - name: timeout
         label:
           en_US: Timeout
@@ -350,6 +392,7 @@ stages:
           zh_Hans: Langflow 服务器的基础 URL
         type: string
         required: true
+        default: 'http://localhost:7860'
       - name: api-key
         label:
           en_US: API Key
@@ -359,6 +402,7 @@ stages:
           zh_Hans: Langflow 服务器的 API 密钥
         type: string
         required: true
+        default: 'your-api-key'
       - name: flow-id
         label:
           en_US: Flow ID
@@ -368,6 +412,7 @@ stages:
           zh_Hans: 要运行的流程 ID
         type: string
         required: true
+        default: 'your-flow-id'
       - name: input-type
         label:
           en_US: Input Type
@@ -415,6 +460,7 @@ stages:
           zh_Hans: Coze服务器的 API 密钥
         type: string
         required: true
+        default: ''
       - name: bot-id
         label:
           en_US: Bot ID
@@ -424,6 +470,7 @@ stages:
           zh_Hans: 要运行的机器人 ID
         type: string
         required: true
+        default: ''
       - name: api-base
         label:
           en_US: API Base URL