feat(core): implement optimistic locking across all entities

Add VersionMismatch error variant and check_version() helper to erp-core.
All 13 mutable entities now enforce version checking on update/delete:
- erp-auth: user, role, organization, department, position
- erp-config: dictionary, dictionary_item, menu, setting, numbering_rule
- erp-workflow: process_definition, process_instance, task
- erp-message: message, message_subscription

Update DTOs to expose version in responses and require version in update
requests. HTTP 409 Conflict returned on version mismatch.

crates/erp-workflow/src/service/definition_service.rs

@@ -10,6 +10,7 @@ use crate::dto::{
 use crate::engine::parser;
 use crate::entity::process_definition;
 use crate::error::{WorkflowError, WorkflowResult};
+use erp_core::error::check_version;
 use erp_core::events::EventBus;
 use erp_core::types::Pagination;
 
@@ -118,6 +119,7 @@ impl DefinitionService {
             status: "draft".to_string(),
             created_at: now,
             updated_at: now,
+            lock_version: 1,
         })
     }
 
@@ -142,6 +144,7 @@ impl DefinitionService {
             ));
         }
 
+        let current_version = model.version_field;
         let mut active: process_definition::ActiveModel = model.into();
 
         if let Some(name) = &req.name {
@@ -168,6 +171,9 @@ impl DefinitionService {
             active.edges = Set(edges_json);
         }
 
+        let next_ver = check_version(req.version, current_version)
+            .map_err(|_| WorkflowError::VersionMismatch)?;
+        active.version_field = Set(next_ver);
         active.updated_at = Set(Utc::now());
         active.updated_by = Set(operator_id);
 
@@ -207,8 +213,10 @@ impl DefinitionService {
             .map_err(|e| WorkflowError::InvalidDiagram(format!("连线数据无效: {e}")))?;
         parser::parse_and_validate(&nodes, &edges)?;
 
+        let current_version = model.version_field;
         let mut active: process_definition::ActiveModel = model.into();
         active.status = Set("published".to_string());
+        active.version_field = Set(current_version + 1);
         active.updated_at = Set(Utc::now());
         active.updated_by = Set(operator_id);
 
@@ -240,7 +248,9 @@ impl DefinitionService {
             .filter(|m| m.tenant_id == tenant_id && m.deleted_at.is_none())
             .ok_or_else(|| WorkflowError::NotFound(format!("流程定义不存在: {id}")))?;
 
+        let current_version = model.version_field;
         let mut active: process_definition::ActiveModel = model.into();
+        active.version_field = Set(current_version + 1);
         active.deleted_at = Set(Some(Utc::now()));
         active.updated_at = Set(Utc::now());
         active.updated_by = Set(operator_id);
@@ -265,6 +275,7 @@ impl DefinitionService {
             status: m.status.clone(),
             created_at: m.created_at,
             updated_at: m.updated_at,
+            lock_version: m.version_field,
         }
     }
 }