chore: apply cargo fmt across workspace and update docs

- Run cargo fmt on all Rust crates for consistent formatting
- Update CLAUDE.md with WASM plugin commands and dev.ps1 instructions
- Update wiki: add WASM plugin architecture, rewrite dev environment docs
- Minor frontend cleanup (unused imports)

crates/erp-workflow/src/engine/parser.rs

@@ -10,7 +10,10 @@ pub fn parse_and_validate(nodes: &[NodeDef], edges: &[EdgeDef]) -> WorkflowResul
     }
 
     // 检查恰好 1 个 StartEvent
-    let start_count = nodes.iter().filter(|n| n.node_type == NodeType::StartEvent).count();
+    let start_count = nodes
+        .iter()
+        .filter(|n| n.node_type == NodeType::StartEvent)
+        .count();
     if start_count == 0 {
         return Err(WorkflowError::InvalidDiagram(
             "流程图必须包含一个开始事件".to_string(),
@@ -23,7 +26,10 @@ pub fn parse_and_validate(nodes: &[NodeDef], edges: &[EdgeDef]) -> WorkflowResul
     }
 
     // 检查至少 1 个 EndEvent
-    let end_count = nodes.iter().filter(|n| n.node_type == NodeType::EndEvent).count();
+    let end_count = nodes
+        .iter()
+        .filter(|n| n.node_type == NodeType::EndEvent)
+        .count();
     if end_count == 0 {
         return Err(WorkflowError::InvalidDiagram(
             "流程图必须包含至少一个结束事件".to_string(),
@@ -31,8 +37,7 @@ pub fn parse_and_validate(nodes: &[NodeDef], edges: &[EdgeDef]) -> WorkflowResul
     }
 
     // 检查节点 ID 唯一性
-    let node_ids: std::collections::HashSet<&str> =
-        nodes.iter().map(|n| n.id.as_str()).collect();
+    let node_ids: std::collections::HashSet<&str> = nodes.iter().map(|n| n.id.as_str()).collect();
     if node_ids.len() != nodes.len() {
         return Err(WorkflowError::InvalidDiagram(
             "节点 ID 不能重复".to_string(),
@@ -101,7 +106,8 @@ pub fn parse_and_validate(nodes: &[NodeDef], edges: &[EdgeDef]) -> WorkflowResul
                 }
                 // 排他网关的出边应该有条件（第一条可以无条件作为默认分支）
                 if node.node_type == NodeType::ExclusiveGateway && out.len() > 1 {
-                    let with_condition: Vec<_> = out.iter().filter(|e| e.condition.is_some()).collect();
+                    let with_condition: Vec<_> =
+                        out.iter().filter(|e| e.condition.is_some()).collect();
                     if with_condition.is_empty() {
                         return Err(WorkflowError::InvalidDiagram(format!(
                             "排他网关 '{}' 有多条出边但没有条件表达式",