feat(def): 流程定义唯一键改按流程线管 + 归属应用筛选

- flw_def 唯一键 (sch,code,ver)→(sch,flow_guid,ver)（uk_flw_def_guid_ver，生产/本地已手工切索引）：升版本 maxByGuid+1 与唯一键同口径，同编码多条流程线（work-leave 三条线实锤追尾）不再死锁
- 新建永远新开流程线 v1，删除同编码草稿复用；撞唯一键转"保存冲突"友好提示
- 新增 flw_def.app_key 归属应用列：save 全链路透传（升版本缺省继承源线、传非空覆盖）；/admin/def/list 支持 appKey 过滤；新增 /admin/def/appkeys 应用清单（flw_def 已标注 ∪ 已注册回调）
- FlowDefAdminServiceSaveTest 10 用例锁 save 分派语义

src/main/java/com/yunhai/flowcenter/controller/api/FlowAdminController.java

@@ -54,8 +54,15 @@ public class FlowAdminController {
 
     @GetMapping("/def/list")
     public List<FlwDef> defList(BoaUser user,
-                                @RequestParam(value = "status", required = false) Integer status) {
-        return defAdminService.list(adminGuard.requireAdmin(user, null), status);
+                                @RequestParam(value = "status", required = false) Integer status,
+                                @RequestParam(value = "appKey", required = false) String appKey) {
+        return defAdminService.list(adminGuard.requireAdmin(user, null), status, appKey);
+    }
+
+    /** 应用清单（"按应用筛选"下拉）：本校 flw_def 已标注 ∪ 已注册回调的应用 */
+    @GetMapping("/def/appkeys")
+    public List<String> defAppKeys(BoaUser user) {
+        return defAdminService.distinctAppKeys(adminGuard.requireAdmin(user, null));
     }
 
     @GetMapping("/def/get")
@@ -70,7 +77,8 @@ public class FlowAdminController {
         Long id = body.get("id") == null ? null : Long.valueOf(String.valueOf(body.get("id")));
         return defAdminService.save(schId, id,
                 (String) body.get("code"), (String) body.get("name"),
-                (String) body.get("contentJson"), (String) body.get("baseGuid"));
+                (String) body.get("contentJson"), (String) body.get("baseGuid"),
+                (String) body.get("appKey"));
     }
 
     @PostMapping("/def/publish/{id}")