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-core/src/module.rs

@@ -57,7 +57,11 @@ impl ModuleRegistry {
     }
 
     pub fn register(mut self, module: impl ErpModule + 'static) -> Self {
-        tracing::info!(module = module.name(), version = module.version(), "Module registered");
+        tracing::info!(
+            module = module.name(),
+            version = module.version(),
+            "Module registered"
+        );
         let mut modules = (*self.modules).clone();
         modules.push(Arc::new(module));
         self.modules = Arc::new(modules);