fix(plugin): P1 跨插件引用修复 — DateTime generated column + resolve-labels UUID 类型 + EntitySelect manifest→UUID 映射

- manifest.rs: DateTime 类型 generated column 改为 TEXT 存储（PostgreSQL TIMESTAMPTZ cast 非 immutable）
- data_handler.rs: resolve-labels 查询参数从 String 改为 UUID 类型避免类型不匹配
- data_dto.rs: PublicEntityResp 新增 plugin_id 字段
- EntitySelect.tsx: 跨插件查询先通过 registry 解析 manifest_id→plugin UUID
- pluginData.ts: PublicEntity 接口增加 plugin_id
- plugin_tests.rs: 适配 PluginField/PluginEntity 新增字段

crates/erp-server/tests/integration/plugin_tests.rs

@@ -29,6 +29,8 @@ fn make_field(name: &str, field_type: PluginFieldType) -> PluginField {
         validation: None,
         no_cycle: None,
         scope_role: None,
+        ref_plugin: None,
+        ref_fallback_label: None,
     }
 }
 
@@ -48,6 +50,7 @@ fn make_test_manifest() -> PluginManifest {
             entities: vec![PluginEntity {
                 name: "item".to_string(),
                 display_name: "测试项".to_string(),
+                is_public: None,
                 fields: vec![
                     PluginField {
                         name: "code".to_string(),
@@ -95,7 +98,7 @@ fn make_test_manifest() -> PluginManifest {
 #[tokio::test]
 async fn test_dynamic_table_create_and_query() {
     let test_db = TestDb::new().await;
-    let db = &test_db.db;
+    let db = test_db.db();
 
     let manifest = make_test_manifest();
     let entity = &manifest.schema.as_ref().unwrap().entities[0];
@@ -156,7 +159,7 @@ async fn test_dynamic_table_create_and_query() {
 #[tokio::test]
 async fn test_tenant_isolation_in_dynamic_table() {
     let test_db = TestDb::new().await;
-    let db = &test_db.db;
+    let db = test_db.db();
 
     let manifest = make_test_manifest();
     let entity = &manifest.schema.as_ref().unwrap().entities[0];