Feat: Add AgentNode component #3221 (#8019)

### What problem does this PR solve?

Feat: Add AgentNode component #3221

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/agent/canvas/node/agent-node.tsx

@@ -0,0 +1,48 @@
+import { useTheme } from '@/components/theme-provider';
+import { IAgentNode } from '@/interfaces/database/flow';
+import { Handle, NodeProps, Position } from '@xyflow/react';
+import classNames from 'classnames';
+import { memo } from 'react';
+import { LeftHandleStyle, RightHandleStyle } from './handle-icon';
+import styles from './index.less';
+import NodeHeader from './node-header';
+
+function InnerAgentNode({
+  id,
+  data,
+  isConnectable = true,
+  selected,
+}: NodeProps<IAgentNode>) {
+  const { theme } = useTheme();
+  return (
+    <section
+      className={classNames(
+        styles.ragNode,
+        theme === 'dark' ? styles.dark : '',
+        {
+          [styles.selectedNode]: selected,
+        },
+      )}
+    >
+      <Handle
+        id="c"
+        type="source"
+        position={Position.Left}
+        isConnectable={isConnectable}
+        className={styles.handle}
+        style={LeftHandleStyle}
+      ></Handle>
+      <Handle
+        type="source"
+        position={Position.Right}
+        isConnectable={isConnectable}
+        className={styles.handle}
+        id="b"
+        style={RightHandleStyle}
+      ></Handle>
+      <NodeHeader id={id} name={data.name} label={data.label}></NodeHeader>
+    </section>
+  );
+}
+
+export const AgentNode = memo(InnerAgentNode);