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/model.rs

@@ -75,13 +75,16 @@ impl FlowGraph {
         }
 
         for e in edges {
-            graph.edges.insert(e.id.clone(), FlowEdge {
-                id: e.id.clone(),
-                source: e.source.clone(),
-                target: e.target.clone(),
-                condition: e.condition.clone(),
-                label: e.label.clone(),
-            });
+            graph.edges.insert(
+                e.id.clone(),
+                FlowEdge {
+                    id: e.id.clone(),
+                    source: e.source.clone(),
+                    target: e.target.clone(),
+                    condition: e.condition.clone(),
+                    label: e.label.clone(),
+                },
+            );
 
             if let Some(out) = graph.outgoing.get_mut(&e.source) {
                 out.push(e.id.clone());