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/store.ts

@@ -189,13 +189,26 @@ export type ConfirmRequest = {
   items?: string[];
 };
 
+export type AiAgentStepView = {
+  tool: string;
+  args?: string;
+  ok: boolean;
+  summary: string;
+  error?: string;
+  ms: number;
+};
+
 export type AiMessage = {
   id: string;
   role: "user" | "assistant" | "system";
   content: string;
   at: string;
+  /** Agent 工具步骤时间线（仅 assistant） */
+  steps?: AiAgentStepView[];
 };
 
+export type AiChatMode = "ask" | "agent";
+
 export type ViewMode = "workbench" | "picker";
 export type PickerMode = "list" | "drivers";
 
@@ -236,6 +249,8 @@ type State = {
   aiAsk: string;
   aiModel: string;
   aiBusy: boolean;
+  /** Ask=不调工具；Agent=多轮 aitools */
+  aiMode: AiChatMode;
   status: string;
   notifyModal: NotifyPayload | null;
   notifyToasts: NotifyPayload[];
@@ -305,7 +320,7 @@ type State = {
   updateActiveSql: (sql: string) => void;
   /** AI 异步返回只写入原标签；用户编辑或切库后跳过。 */
   updateTabSqlIfUnchanged: (id: string, originalSql: string, connectionId: string | undefined, database: string | undefined, sql: string) => boolean;
-  pushAi: (role: AiMessage["role"], content: string) => void;
+  pushAi: (role: AiMessage["role"], content: string, steps?: AiAgentStepView[]) => void;
   setSession: (connectionId: string, sessionId: string | null) => void;
   pushHistory: (item: Omit<QueryHistoryItem, "id" | "at"> & { at?: number }) => void;
   clearHistory: () => void;
@@ -465,6 +480,7 @@ export const useWorkspaceStore = create<State>((set, get) => ({
   aiAsk: "",
   aiModel: "opsxdb-stub",
   aiBusy: false,
+  aiMode: "ask",
   status: "就绪",
   notifyModal: null,
   notifyToasts: [],
@@ -878,11 +894,11 @@ export const useWorkspaceStore = create<State>((set, get) => ({
     return true;
   },
 
-  pushAi: (role, content) =>
+  pushAi: (role, content, steps) =>
     set((s) => ({
       aiMessages: [
         ...s.aiMessages,
-        { id: crypto.randomUUID(), role, content, at: new Date().toLocaleTimeString() },
+        { id: crypto.randomUUID(), role, content, at: new Date().toLocaleTimeString(), steps },
       ],
     })),