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/handler/instance_handler.rs

@@ -23,7 +23,8 @@ where
     S: Clone + Send + Sync + 'static,
 {
     require_permission(&ctx, "workflow.start")?;
-    req.validate().map_err(|e| AppError::Validation(e.to_string()))?;
+    req.validate()
+        .map_err(|e| AppError::Validation(e.to_string()))?;
 
     let resp = InstanceService::start(
         ctx.tenant_id,
@@ -49,8 +50,7 @@ where
 {
     require_permission(&ctx, "workflow.list")?;
 
-    let (instances, total) =
-        InstanceService::list(ctx.tenant_id, &pagination, &state.db).await?;
+    let (instances, total) = InstanceService::list(ctx.tenant_id, &pagination, &state.db).await?;
 
     let page = pagination.page.unwrap_or(1);
     let page_size = pagination.limit();