feat(chat): Implement comprehensive chat functionality for customer and advisor interactions

- Introduced new chat components including `ChatPanel` and `VisitorChatWidget` to facilitate real-time conversations for customers and visitors.
- Developed a robust chat API with endpoints for synchronous and streaming interactions, enhancing user engagement.
- Added new pages for customer interactions, including `CustomerChatPage`, `CustomerProfilePage`, `CustomerHoldingsPage`, and `CustomerTradesPage`, integrating chat capabilities seamlessly.
- Enhanced the advisor experience with the `AdvisorCustomersPage` and `RiskAlertsPage`, allowing for efficient management of customer interactions and risk alerts.
- Updated routing and state management to support new chat functionalities, ensuring a cohesive user experience across the application.

This update significantly improves the chat capabilities within the application, providing users with enhanced tools for communication and support.

web/src/utils/__tests__/parseChatStream.test.ts

@@ -0,0 +1,48 @@
+import { describe, expect, it } from 'vitest'
+import { parseChatStreamBuffer, parseSseDataPayload } from '../parseChatStream'
+
+describe('parseSseDataPayload', () => {
+  it('parses meta frame', () => {
+    const event = parseSseDataPayload(
+      JSON.stringify({
+        choices: [{ delta: { role: 'assistant' } }],
+        meta: { session_id: 'sess-1', has_disclaimer: true, disclaimer: '风险提示' },
+      }),
+    )
+    expect(event).toEqual({
+      type: 'meta',
+      meta: { session_id: 'sess-1', has_disclaimer: true, disclaimer: '风险提示' },
+    })
+  })
+
+  it('parses delta content', () => {
+    const event = parseSseDataPayload(
+      JSON.stringify({ choices: [{ delta: { content: '你好' } }] }),
+    )
+    expect(event).toEqual({ type: 'delta', content: '你好' })
+  })
+
+  it('parses error frame', () => {
+    const event = parseSseDataPayload(
+      JSON.stringify({ error: { code: 'STREAM_FAILED', message: '生成失败' } }),
+    )
+    expect(event).toEqual({ type: 'error', code: 'STREAM_FAILED', message: '生成失败' })
+  })
+
+  it('parses DONE marker', () => {
+    expect(parseSseDataPayload('[DONE]')).toEqual({ type: 'done' })
+  })
+})
+
+describe('parseChatStreamBuffer', () => {
+  it('walks multi-line SSE chunk', () => {
+    const buffer = [
+      'data: {"choices":[{"delta":{"content":"A"}}]}',
+      '',
+      'data: [DONE]',
+      '',
+    ].join('\n')
+    const events = [...parseChatStreamBuffer(buffer)]
+    expect(events).toEqual([{ type: 'delta', content: 'A' }, { type: 'done' }])
+  })
+})