refactor(usePagination): 将分页分组逻辑从divider改为paginator并更新相关属性名

更新分页分组逻辑，使用paginator作为分组边界标识
将page_prev_text、page_next_text和page_prev_disabled属性分别更名为back_title、next_title和is_back以保持命名一致性

@@ -42,15 +42,15 @@ export function usePagination(formDataRef, options = {}) {
 
     /**
      * 构建分页分组
-     * @description 优先按 divider 分组；若仅一组则按固定大小分片
+     * @description 优先按 paginator 分组；若仅一组则按固定大小分片
      */
     const buildPages = () => {
         const result = []
         let cur = []
         formDataRef.value.forEach(item => {
             const tag = item.component_props?.tag
-            // 分隔符 divider 作为分页分组边界
-            if (tag === 'divider') {
+            // 分隔符 paginator 作为分页分组边界
+            if (tag === 'paginator') {
                 if (cur.length) result.push(cur)
                 cur = []
                 return
@@ -60,7 +60,7 @@ export function usePagination(formDataRef, options = {}) {
         if (cur.length) result.push(cur)
         if (result.length <= 1) {
             const size = 8
-            const keys = formDataRef.value.filter(i => i.component_props?.tag !== 'divider').map(i => i.key)
+            const keys = formDataRef.value.filter(i => i.component_props?.tag !== 'paginator').map(i => i.key)
             const chunked = []
             for (let i = 0; i < keys.length; i += size) {
                 chunked.push(keys.slice(i, i + size))
@@ -94,9 +94,9 @@ export function usePagination(formDataRef, options = {}) {
         for (let k of keys) {
             const item = formDataRef.value.find(i => i.key === k)
             if (item && item.component_props) {
-                if (item.component_props.page_prev_text) prev_text = item.component_props.page_prev_text
-                if (item.component_props.page_next_text) next_text = item.component_props.page_next_text
-                if (typeof item.component_props.page_prev_disabled === 'boolean') prev_disabled = item.component_props.page_prev_disabled
+                if (item.component_props.back_title) prev_text = item.component_props.back_title
+                if (item.component_props.next_title) next_text = item.component_props.next_title
+                if (typeof item.component_props.is_back === 'boolean') prev_disabled = item.component_props.is_back
             }
         }
         return { prev_text, next_text, prev_disabled }
@@ -173,4 +173,4 @@ export function usePagination(formDataRef, options = {}) {
         handleNext,
         handleSubmit,
     }
-}
\ No newline at end of file
+}