feat(dashboard): create DynamicField renderer component

- Render fields based on x-widget or type
- Support slider, switch, textarea, select, custom widgets
- Include label, icon, description rendering
- Placeholder for unsupported types (array, object)

Completes Task 5 of webui-config-visualization-refactor plan.

dashboard/src/components/dynamic-form/DynamicField.tsx

@@ -0,0 +1,246 @@
+import * as React from "react"
+import * as LucideIcons from "lucide-react"
+
+import { Input } from "@/components/ui/input"
+import { Label } from "@/components/ui/label"
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select"
+import { Slider } from "@/components/ui/slider"
+import { Switch } from "@/components/ui/switch"
+import { Textarea } from "@/components/ui/textarea"
+import type { FieldSchema } from "@/types/config-schema"
+
+export interface DynamicFieldProps {
+  schema: FieldSchema
+  value: unknown
+  onChange: (value: unknown) => void
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  fieldPath?: string // 用于 Hook 系统（未来使用）
+}
+
+/**
+ * DynamicField - 根据字段类型和 x-widget 渲染对应的 shadcn/ui 组件
+ * 
+ * 渲染逻辑：
+ * 1. x-widget 优先：如果 schema 有 x-widget，使用对应组件
+ * 2. type 回退：如果没有 x-widget，根据 type 选择默认组件
+ */
+export const DynamicField: React.FC<DynamicFieldProps> = ({
+  schema,
+  value,
+  onChange,
+}) => {
+  /**
+   * 渲染字段图标
+   */
+  const renderIcon = () => {
+    if (!schema['x-icon']) return null
+    
+    const IconComponent = (LucideIcons as any)[schema['x-icon']]
+    if (!IconComponent) return null
+    
+    return <IconComponent className="h-4 w-4" />
+  }
+
+  /**
+   * 根据 x-widget 或 type 选择并渲染对应的输入组件
+   */
+  const renderInputComponent = () => {
+    const widget = schema['x-widget']
+    const type = schema.type
+
+    // x-widget 优先
+    if (widget) {
+      switch (widget) {
+        case 'slider':
+          return renderSlider()
+        case 'switch':
+          return renderSwitch()
+        case 'textarea':
+          return renderTextarea()
+        case 'select':
+          return renderSelect()
+        case 'custom':
+          return (
+            <div className="rounded-md border border-dashed border-muted-foreground/25 bg-muted/10 p-4 text-center text-sm text-muted-foreground">
+              Custom field requires Hook
+            </div>
+          )
+        default:
+          // 未知的 x-widget，回退到 type
+          break
+      }
+    }
+
+    // type 回退
+    switch (type) {
+      case 'boolean':
+        return renderSwitch()
+      case 'number':
+      case 'integer':
+        return renderNumberInput()
+      case 'string':
+        return renderTextInput()
+      case 'select':
+        return renderSelect()
+      case 'array':
+        return (
+          <div className="rounded-md border border-dashed border-muted-foreground/25 bg-muted/10 p-4 text-center text-sm text-muted-foreground">
+            Array fields not yet supported
+          </div>
+        )
+      case 'object':
+        return (
+          <div className="rounded-md border border-dashed border-muted-foreground/25 bg-muted/10 p-4 text-center text-sm text-muted-foreground">
+            Object fields not yet supported
+          </div>
+        )
+      case 'textarea':
+        return renderTextarea()
+      default:
+        return (
+          <div className="rounded-md border border-dashed border-muted-foreground/25 bg-muted/10 p-4 text-center text-sm text-muted-foreground">
+            Unknown field type: {type}
+          </div>
+        )
+    }
+  }
+
+  /**
+   * 渲染 Switch 组件（用于 boolean 类型）
+   */
+  const renderSwitch = () => {
+    const checked = Boolean(value)
+    return (
+      <Switch
+        checked={checked}
+        onCheckedChange={(checked) => onChange(checked)}
+      />
+    )
+  }
+
+  /**
+   * 渲染 Slider 组件（用于 number 类型 + x-widget: slider）
+   */
+  const renderSlider = () => {
+    const numValue = typeof value === 'number' ? value : (schema.default as number ?? 0)
+    const min = schema.minValue ?? 0
+    const max = schema.maxValue ?? 100
+    const step = schema.step ?? 1
+
+    return (
+      <div className="space-y-2">
+        <Slider
+          value={[numValue]}
+          onValueChange={(values) => onChange(values[0])}
+          min={min}
+          max={max}
+          step={step}
+        />
+        <div className="flex justify-between text-xs text-muted-foreground">
+          <span>{min}</span>
+          <span className="font-medium text-foreground">{numValue}</span>
+          <span>{max}</span>
+        </div>
+      </div>
+    )
+  }
+
+  /**
+   * 渲染 Input[type="number"] 组件（用于 number/integer 类型）
+   */
+  const renderNumberInput = () => {
+    const numValue = typeof value === 'number' ? value : (schema.default as number ?? 0)
+    const min = schema.minValue
+    const max = schema.maxValue
+    const step = schema.step ?? (schema.type === 'integer' ? 1 : 0.1)
+
+    return (
+      <Input
+        type="number"
+        value={numValue}
+        onChange={(e) => onChange(parseFloat(e.target.value) || 0)}
+        min={min}
+        max={max}
+        step={step}
+      />
+    )
+  }
+
+  /**
+   * 渲染 Input[type="text"] 组件（用于 string 类型）
+   */
+  const renderTextInput = () => {
+    const strValue = typeof value === 'string' ? value : (schema.default as string ?? '')
+    return (
+      <Input
+        type="text"
+        value={strValue}
+        onChange={(e) => onChange(e.target.value)}
+      />
+    )
+  }
+
+  /**
+   * 渲染 Textarea 组件（用于 textarea 类型或 x-widget: textarea）
+   */
+  const renderTextarea = () => {
+    const strValue = typeof value === 'string' ? value : (schema.default as string ?? '')
+    return (
+      <Textarea
+        value={strValue}
+        onChange={(e) => onChange(e.target.value)}
+        rows={4}
+      />
+    )
+  }
+
+  /**
+   * 渲染 Select 组件（用于 select 类型或 x-widget: select）
+   */
+  const renderSelect = () => {
+    const strValue = typeof value === 'string' ? value : (schema.default as string ?? '')
+    const options = schema.options ?? []
+
+    if (options.length === 0) {
+      return (
+        <div className="rounded-md border border-dashed border-muted-foreground/25 bg-muted/10 p-4 text-center text-sm text-muted-foreground">
+          No options available for select
+        </div>
+      )
+    }
+
+    return (
+      <Select value={strValue} onValueChange={(val) => onChange(val)}>
+        <SelectTrigger>
+          <SelectValue placeholder={`Select ${schema.label}`} />
+        </SelectTrigger>
+        <SelectContent>
+          {options.map((option) => (
+            <SelectItem key={option} value={option}>
+              {option}
+            </SelectItem>
+          ))}
+        </SelectContent>
+      </Select>
+    )
+  }
+
+  return (
+    <div className="space-y-2">
+      {/* Label with icon */}
+      <Label className="text-sm font-medium flex items-center gap-2">
+        {renderIcon()}
+        {schema.label}
+        {schema.required && <span className="text-destructive">*</span>}
+      </Label>
+
+      {/* Input component */}
+      {renderInputComponent()}
+
+      {/* Description */}
+      {schema.description && (
+        <p className="text-sm text-muted-foreground">{schema.description}</p>
+      )}
+    </div>
+  )
+}