feat: 高德地图工具 + 多轮 bug 修复

新增:
- 高德地图 6 个内置工具: amap_poi_search, amap_geocode, amap_reverse_geocode, amap_route_plan, amap_travel_plan, amap_map_link
- CLI 子命令: ias tool amap (poi-search/geocode/route-plan/travel-plan/map-link)
- 工具优先级指南: build_capability_guide() 含 amap > weather > web_search 优先级
- DEFAULT_SYSTEM_PROMPT 内置工具优先级说明（不再依赖环境变量）

Bug 修复:
1. (HIGH) call_capability 参数契约修复 — 新增 unpack_call_params() 统一解包 prompt 字段
2. (MEDIUM) 天气 hours=0 不再调用逐时 API
3. (MEDIUM) 长期记忆 daemon 双写缓存+DB，无 DB 不丢失
4. (HIGH) 审批流程状态语义修复 — handle_reply 返回 ApprovalDecision，拒绝/过期不再当作通过
5. (HIGH) 审批有效期基于 expires_at 时间戳而非 receiver drop
6. (MEDIUM) 摘要保存改为 current_user_id 与读取一致
7. (MEDIUM) worker 审批通过后删除孤立 tool result，仅保留 approved_tool 状态放行

架构:
- daemon + worker IPC 架构 (Unix Domain Socket)
- build_capability_guide 共享函数消除 main.rs/worker.rs 重复

src/context/tools.rs

@@ -82,7 +82,8 @@ pub async fn read_summaries(
     }
 
     if let Some(pool) = &s.db_pool {
-        if let Ok(db_summaries) = crate::db::models::load_summaries(pool, 5).await {
+        let uid = if s.current_user_id.is_empty() { "default" } else { &s.current_user_id };
+        if let Ok(db_summaries) = crate::db::models::load_summaries(pool, uid, 5).await {
             for text in db_summaries {
                 if !lines.iter().any(|l| l.contains(&text.chars().take(30).collect::<String>())) {
                     lines.push(format!("[数据库存档] {}", text));