feat: 支持单位筛选改 IN 查询 (后端)

BizProject.sponsorOrgName 字段历史上同时承担「查询参数 + 列表展示」两个职责, 现拆开:
- 保留: sponsorOrgName (String), 列表展示, JOIN biz_org 派生
- 新增: sponsorAdminUserIds (List<Long>), 查询参数, IN 多个 user_id

对齐方案 1 设计 (与 DB 列 sponsor_admin_user_id 命名一致, 与 assignForm.sponsorAdminUserId 单数版对齐)。

改动:
- BizProject.java: 加 import java.util.List; 加 List<Long> sponsorAdminUserIds + getter/setter; 改 sponsorOrgName 注释 (不再当查询参数, 只展示)
- BizProjectMapper.xml L167-173: 替换 sponsorOrgName LIKE 块为 sponsorAdminUserIds IN 块 (foreach 展开)
- BizOrgMapper.xml L120: selectSponsorOrgOptions 末尾加 LIMIT 5 (前端多选下拉最多 5 条)

未做:
- 前端 manager/Projects.vue L6 el-input 还在 (下一 commit 切到 el-select multiple)
- 旧的 sponsorOrgName LIKE 块已不存在, 但前端 q.sponsorOrgName 字段也还没改 (prototype 兼容期)

ry-api/ruoyi-business/src/main/java/com/ruoyi/business/domain/BizProject.java

@@ -2,6 +2,7 @@ package com.ruoyi.business.domain;
 
 import java.math.BigDecimal;
 import java.util.Date;
+import java.util.List;
 import com.fasterxml.jackson.annotation.JsonFormat;
 import com.ruoyi.common.annotation.Excel;
 import com.ruoyi.common.core.domain.BaseEntity;
@@ -51,8 +52,10 @@ public class BizProject extends BaseEntity {
     /** 支持方负责人用户名(冗余) — 原 org_name */
     @Excel(name = "sponsor_admin_user_name")
     private String sponsorAdminUserName;
-    /** 支持单位名称 (查询参数 + 列表展示列, JOIN biz_org 取 org_name, org_type='sponsor') */
+    /** 支持单位名称 (列表展示列, JOIN biz_org 取 org_name, org_type='sponsor') */
     private String sponsorOrgName;
+    /** 支持单位筛选 (sys_user.user_id 列表, IN 查询, 多选 select 透传) */
+    private List<Long> sponsorAdminUserIds;
     /** 服务机构名称 (查询条件, 仅匹配 org_type='executor' + org_name LIKE) */
     private String execOrgName;
     /** 服务机构名称列表, 多个用英文逗号连接 (GROUP_CONCAT 派生, 不入库, 仅展示) */
@@ -163,6 +166,8 @@ public class BizProject extends BaseEntity {
     public void setSponsorAdminUserName(String sponsorAdminUserName) { this.sponsorAdminUserName = sponsorAdminUserName; }
     public String getSponsorOrgName() { return sponsorOrgName; }
     public void setSponsorOrgName(String sponsorOrgName) { this.sponsorOrgName = sponsorOrgName; }
+    public List<Long> getSponsorAdminUserIds() { return sponsorAdminUserIds; }
+    public void setSponsorAdminUserIds(List<Long> sponsorAdminUserIds) { this.sponsorAdminUserIds = sponsorAdminUserIds; }
     public String getExecOrgName() { return execOrgName; }
     public void setExecOrgName(String execOrgName) { this.execOrgName = execOrgName; }
     public String getExecOrgNames() { return execOrgNames; }

ry-api/ruoyi-business/src/main/resources/mapper/business/BizOrgMapper.xml

@@ -118,6 +118,7 @@
           <if test="userId != null">and o.user_id = #{userId}</if>
           <if test="orgName != null and orgName != ''">and o.org_name like concat('%', #{orgName}, '%')</if>
         order by o.org_id desc
+        LIMIT 5
     </select>
 
     <!--

ry-api/ruoyi-business/src/main/resources/mapper/business/BizProjectMapper.xml

@@ -164,13 +164,11 @@
             <if test="projectNo != null and projectNo != ''">and project_no like concat('%', #{projectNo}, '%')</if>
             <if test="projectName != null and projectName != ''">and project_name like concat('%', #{projectName}, '%')</if>
             <if test="projectForm != null and projectForm != ''">and project_form = #{projectForm}</if>
-            <if test="sponsorOrgName != null and sponsorOrgName != ''">
+            <if test="sponsorAdminUserIds != null and sponsorAdminUserIds.size() > 0">
-                and exists (
+                and sponsor_admin_user_id in
-                    select 1 from biz_org o
+                <foreach collection="sponsorAdminUserIds" item="id" open="(" separator="," close=")">
-                    where o.user_id = sponsor_admin_user_id
+                    #{id}
-                      and o.org_type = 'sponsor'
+                </foreach>
-                      and o.org_name like concat('%', #{sponsorOrgName}, '%')
-                )
             </if>
             <if test="execOrgName != null and execOrgName != ''">
                 and exists (