feat(ai): 阶段 2 Ask|Agent 共用 aitools Runtime 真查库

- 侧栏 Ask|Agent 分段；Ask 仍走 /api/ai/chat，Agent 走 /api/ai/agent
- RunAgent 多轮 tool call → 进程内 aitools（与 MCP 同源只读/白名单/审计）
- 回复下步骤时间线；openai-chat tools（DeepSeek）；agent-accept 冒烟

src/api.ts

@@ -525,6 +525,33 @@ export async function callAi(payload: {
   return post<{ content: string; sql?: string }>("/api/ai/chat", payload);
 }
 
+/** 阶段 2：Agent 模式 — 服务端多轮调同一 aitools Runtime（Ask 仍用 callAi） */
+export type AiAgentStep = {
+  tool: string;
+  args?: string;
+  ok: boolean;
+  summary: string;
+  error?: string;
+  ms: number;
+};
+
+export type AiAgentRes = {
+  content: string;
+  sql?: string;
+  steps: AiAgentStep[];
+  rounds: number;
+};
+
+export async function callAiAgent(payload: {
+  prompt: string;
+  connectionId?: string;
+  driver?: string;
+  database?: string;
+  model?: string;
+}) {
+  return post<AiAgentRes>("/api/ai/agent", payload);
+}
+
 /** C4:AI 配置(key 脱敏,只回掩码与是否已配置);protocol/authStyle/allowInsecureHttp 见 aiPresets.ts */
 export type AiConfig = {
   provider: string;