refactor(video): PageHelper → PageResult 分页迁移，删除 shim 兼容类

- 54 个文件从 PageHelper.startPage() + PageInfo 迁移到 MyBatis Plus Page + PageResult
- 复杂 @Select 查询加 IPage 参数实现自动分页
- 删除 PageHelper/PageInfo/StringUtil 3 个 shim 文件

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

viewsh-module-video/viewsh-module-video-server/src/main/java/com/github/pagehelper/PageHelper.java

@@ -1,25 +0,0 @@
-package com.github.pagehelper;
-
-/**
- * PageHelper compatibility shim for WVP migration.
- * startPage() is a no-op — actual pagination needs to be replaced with MyBatis Plus.
- * TODO: Phase 5.7 - migrate all usages to MyBatis Plus selectPage()
- */
-public class PageHelper {
-
-    private PageHelper() {}
-
-    /**
-     * No-op stub. TODO: Replace with MyBatis Plus pagination.
-     */
-    public static void startPage(int pageNum, int pageSize) {
-        // no-op stub for compilation
-    }
-
-    /**
-     * No-op stub. TODO: Replace with MyBatis Plus pagination.
-     */
-    public static void startPage(int pageNum, int pageSize, String orderBy) {
-        // no-op stub for compilation
-    }
-}

viewsh-module-video/viewsh-module-video-server/src/main/java/com/github/pagehelper/PageInfo.java

@@ -1,105 +0,0 @@
-package com.github.pagehelper;
-
-import java.io.Serializable;
-import java.util.ArrayList;
-import java.util.List;
-
-/**
- * PageHelper compatibility shim for WVP migration.
- * Wraps the basic pagination data needed by the migrated code.
- * TODO: Phase 5.7 - migrate to viewsh PageResult<T> properly
- */
-public class PageInfo<T> implements Serializable {
-
-    private long total;
-    private List<T> list;
-    private int pageNum;
-    private int pageSize;
-    private int pages;
-    private int startRow;
-    private int endRow;
-    private int size;
-    private int prePage;
-    private int nextPage;
-    private boolean isFirstPage;
-    private boolean isLastPage;
-    private boolean hasPreviousPage;
-    private boolean hasNextPage;
-    private int navigatePages = 8;
-    private int[] navigatepageNums = new int[0];
-    private int navigateFirstPage;
-    private int navigateLastPage;
-
-    public PageInfo() {
-        this.list = new ArrayList<>();
-    }
-
-    public PageInfo(List<T> list) {
-        this.list = list != null ? list : new ArrayList<>();
-        this.total = this.list.size();
-        this.size = this.list.size();
-        this.pageSize = this.list.size();
-        this.pageNum = 1;
-        this.pages = 1;
-    }
-
-    public PageInfo(List<T> list, long total) {
-        this.list = list != null ? list : new ArrayList<>();
-        this.total = total;
-        this.size = this.list.size();
-    }
-
-    public long getTotal() { return total; }
-    public void setTotal(long total) { this.total = total; }
-
-    public List<T> getList() { return list; }
-    public void setList(List<T> list) { this.list = list; }
-
-    public int getPageNum() { return pageNum; }
-    public void setPageNum(int pageNum) { this.pageNum = pageNum; }
-
-    public int getPageSize() { return pageSize; }
-    public void setPageSize(int pageSize) { this.pageSize = pageSize; }
-
-    public int getPages() { return pages; }
-    public void setPages(int pages) { this.pages = pages; }
-
-    public int getStartRow() { return startRow; }
-    public void setStartRow(int startRow) { this.startRow = startRow; }
-
-    public int getEndRow() { return endRow; }
-    public void setEndRow(int endRow) { this.endRow = endRow; }
-
-    public int getSize() { return size; }
-    public void setSize(int size) { this.size = size; }
-
-    public int getPrePage() { return prePage; }
-    public void setPrePage(int prePage) { this.prePage = prePage; }
-
-    public int getNextPage() { return nextPage; }
-    public void setNextPage(int nextPage) { this.nextPage = nextPage; }
-
-    public boolean isIsFirstPage() { return isFirstPage; }
-    public void setIsFirstPage(boolean isFirstPage) { this.isFirstPage = isFirstPage; }
-
-    public boolean isIsLastPage() { return isLastPage; }
-    public void setIsLastPage(boolean isLastPage) { this.isLastPage = isLastPage; }
-
-    public boolean isHasPreviousPage() { return hasPreviousPage; }
-    public void setHasPreviousPage(boolean hasPreviousPage) { this.hasPreviousPage = hasPreviousPage; }
-
-    public boolean isHasNextPage() { return hasNextPage; }
-    public void setHasNextPage(boolean hasNextPage) { this.hasNextPage = hasNextPage; }
-
-    public int getNavigatePages() { return navigatePages; }
-    public void setNavigatePages(int navigatePages) { this.navigatePages = navigatePages; }
-
-    public int[] getNavigatepageNums() { return navigatepageNums; }
-    public void setNavigatepageNums(int[] navigatepageNums) { this.navigatepageNums = navigatepageNums; }
-
-    public int getNavigateFirstPage() { return navigateFirstPage; }
-    public void setNavigateFirstPage(int navigateFirstPage) { this.navigateFirstPage = navigateFirstPage; }
-
-    public int getNavigateLastPage() { return navigateLastPage; }
-    public void setNavigateLastPage(int navigateLastPage) { this.navigateLastPage = navigateLastPage; }
-}

viewsh-module-video/viewsh-module-video-server/src/main/java/com/github/pagehelper/util/StringUtil.java

@@ -1,18 +0,0 @@
-package com.github.pagehelper.util;
-
-/**
- * PageHelper StringUtil compatibility shim.
- * TODO: Replace usages with Hutool StrUtil or StringUtils
- */
-public class StringUtil {
-
-    private StringUtil() {}
-
-    public static boolean isEmpty(String str) {
-        return str == null || str.isEmpty();
-    }
-
-    public static boolean isNotEmpty(String str) {
-        return !isEmpty(str);
-    }
-}