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)

apps/web/src/pages/Workflow.tsx

@@ -1,5 +1,5 @@
 import { useState } from 'react';
-import { Tabs, theme } from 'antd';
+import { Tabs } from 'antd';
 import { PartitionOutlined, FileSearchOutlined, CheckSquareOutlined, MonitorOutlined } from '@ant-design/icons';
 import ProcessDefinitions from './workflow/ProcessDefinitions';
 import PendingTasks from './workflow/PendingTasks';
@@ -8,8 +8,6 @@ import InstanceMonitor from './workflow/InstanceMonitor';
 
 export default function Workflow() {
   const [activeKey, setActiveKey] = useState('definitions');
-  const { token } = theme.useToken();
-  const isDark = token.colorBgContainer === '#111827' || token.colorBgContainer === 'rgb(17, 24, 39)';
 
   return (
     <div>