feat(xingbang): 兴邦金租 AI 评审平台前端页面(深色商务风)

- 独立路由 /xingbang: 兴邦评审工作台
- 五智能体流水线可视化(状态动画: 排队/运行/成功/失败)
- 评审任务表单(客户/金额/租赁物) + SSE 实时进度
- 审批结论卡片(五智能体产出) + 自进化洞察面板
- Navbar 加兴邦评审入口, 支持返回聊天
- 深色商务风 (渐变背景/玻璃拟态/金蓝主题)
- api.ts 新增兴邦 API 调用(workflow/evolution/trajectories)

前端已在 next dev 验证渲染 OK, 后端 API 就绪(7条轨迹样本)

src/lib/api.ts

@@ -254,3 +254,80 @@ export async function setRagMode(
   if (!resp.ok) throw new Error(`Failed to set RAG mode: ${resp.status}`);
   return resp.json();
 }
+
+/* ── 兴邦金租评审平台 API ───────────────────────────── */
+
+/** 兴邦项目配置(数据源/五智能体/档位)。 */
+export async function getXingbangConfig(): Promise<any> {
+  const resp = await fetch(`${API_BASE}/xingbang/config`);
+  if (!resp.ok) throw new Error(`Xingbang config error: ${resp.status}`);
+  return resp.json();
+}
+
+/**
+ * 流式运行兴邦五智能体审批流水线(SSE)。
+ * 逐步 yield: agent_start / agent_end / done。
+ */
+export async function* streamXingbangWorkflow(
+  task: string,
+  customer: string
+): AsyncGenerator<SSEEvent> {
+  const response = await fetch(`${API_BASE}/xingbang/workflow/stream`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ task, customer }),
+  });
+  if (!response.ok) throw new Error(`Xingbang workflow error: ${response.status}`);
+  const reader = response.body?.getReader();
+  if (!reader) throw new Error("No response body");
+  const decoder = new TextDecoder();
+  let buffer = "";
+
+  while (true) {
+    const { done, value } = await reader.read();
+    if (done) break;
+    buffer += decoder.decode(value, { stream: true });
+    const lines = buffer.split("\n");
+    buffer = lines.pop() || "";
+    let currentEvent = "message";
+    for (const line of lines) {
+      if (line.startsWith("event:")) {
+        currentEvent = line.slice(6).trim();
+      } else if (line.startsWith("data:")) {
+        const dataStr = line.slice(5).trim();
+        if (dataStr) {
+          try {
+            yield { event: currentEvent, data: JSON.parse(dataStr) };
+          } catch {
+            /* skip */
+          }
+        }
+      }
+      if (line === "") currentEvent = "message";
+    }
+  }
+}
+
+/** 兴邦自进化洞察。 */
+export async function getXingbangEvolution(): Promise<any> {
+  const resp = await fetch(`${API_BASE}/xingbang/evolution`);
+  if (!resp.ok) throw new Error(`Xingbang evolution error: ${resp.status}`);
+  return resp.json();
+}
+
+/** 兴邦历史轨迹列表。 */
+export async function listXingbangTrajectories(): Promise<any> {
+  const resp = await fetch(`${API_BASE}/xingbang/trajectories`);
+  if (!resp.ok) throw new Error(`Xingbang trajectories error: ${resp.status}`);
+  return resp.json();
+}
+
+/** 读取单条兴邦轨迹。 */
+export async function getXingbangTrajectory(id: string): Promise<any> {
+  const resp = await fetch(
+    `${API_BASE}/xingbang/trajectories/${encodeURIComponent(id)}`
+  );
+  if (!resp.ok) throw new Error(`Xingbang trajectory error: ${resp.status}`);
+  return resp.json();
+}
+