fix(header): update boolean form type to checkbox and improve JSX formatting in form input component

web/app/components/header/account-setting/model-provider-page/declarations.ts

   secretInput = 'secret-input',
   select = 'select',
   radio = 'radio',
-  boolean = 'boolean',
+  boolean = 'checkbox',
   files = 'files',
   file = 'file',
   modelSelector = 'model-selector',

web/app/components/workflow/nodes/_base/components/form-input-item.tsx

     //   return VarType.appSelector
     // else if (isModelSelector)
     //   return VarType.modelSelector
-    // else if (isBoolean)
-    //   return VarType.boolean
+    else if (isBoolean)
+      return VarType.boolean
     else if (isObject)
       return VarType.object
     else if (isArray)
   return (
     <div className={cn('gap-1', !(isShowJSONEditor && isConstant) && 'flex')}>
       {showTypeSwitch && (
-        <FormInputTypeSwitch value={varInput?.type || VarKindType.constant} onChange={handleTypeChange}/>
+        <FormInputTypeSwitch value={varInput?.type || VarKindType.constant} onChange={handleTypeChange} />
       )}
       {isString && (
         <MixedVariableTextInput
           placeholder={placeholder?.[language] || placeholder?.en_US}
         />
       )}
-      {isBoolean && (
+      {isBoolean && isConstant && (
         <FormInputBoolean
           value={varInput?.value as boolean}
           onChange={handleValueChange}