feat(sessions): 一键归档 + 归档用量快照落库 — bump to v0.7.18

- archive_sessions_before：按 updatedAt 截止点批量元数据归档（1月/半月/周/指定日期）
- 归档瞬间聚合 wire.jsonl 用量按天×模型快照进 SQLite archived_sessions 表
- 统计合并：文件已删除的归档会话由快照合成 UsageRecord 注入
  get_summary/日明细，趋势/热力图/模型统计全兼容且绝不双计
- models-dev 快照同步 2026-09-14（7784 模型）；pricing 测试跟随
  deepseek-v4-flash 调价（0.15/0.60）
- cargo test 129 通过（含端到端归档→删目录→统计保留用例）、tsc 零错误

src/hooks/useSessions.ts

@@ -2,6 +2,7 @@ import { useCallback, useEffect, useState } from "react";
 import { invoke } from "@tauri-apps/api/core";
 import type {
   ActionResponse,
+  BulkArchiveResult,
   PreviewResult,
   SessionStatusFilter,
   SessionsResult,
@@ -54,6 +55,17 @@ export function useSessions() {
     [refresh]
   );
 
+  const archiveBefore = useCallback(
+    async (cutoffMs: number) => {
+      const result = await invoke<BulkArchiveResult>("archive_sessions_before", {
+        cutoffMs,
+      });
+      await refresh();
+      return result;
+    },
+    [refresh]
+  );
+
   const deleteSession = useCallback(
     async (workspaceId: string, sessionId: string, sessionStatus?: string) => {
       await invoke<ActionResponse>("delete_session", {
@@ -100,6 +112,7 @@ export function useSessions() {
     refresh,
     archiveSession,
     unarchiveSession,
+    archiveBefore,
     deleteSession,
     deleteWorkspace,
     getPreview,