perf: 启用 WAL 模式并添加 B-Tree 索引以加速查询#1253
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- 启用 WAL journal 模式，实现读写并发（搜索时不阻塞剪贴板写入） - 添加 B-Tree 索引：createTime、group+createTime、favorite+createTime - 配合分页查询（ORDER BY createTime DESC LIMIT），索引可显著减少扫描行数 相关 issues：EcoPasteHub#467
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概述
为大数据量用户优化查询性能。
改动
PRAGMA journal_mode = WAL，读写并发，搜索时不阻塞剪贴板写入idx_history_createTime：加速ORDER BY createTime DESC LIMIT分页查询idx_history_group_createTime：加速按分组筛选 + 排序idx_history_favorite_createTime：加速收藏筛选 + 排序配合现有的分页查询（
LIMIT 20），索引可以让 SQLite 沿索引顺序扫描并提前终止，减少不必要的全表扫描。无副作用
IF NOT EXISTS，对已有数据库安全相关 issues：#467