逐任务真实成本：上游用量事件 + 价目表计价

此前每任务只记一条 estimated（字符数/4，金额为空），注释称
host 协议不暴露真实 token 数。本轮实测推翻了该前提：
- account/usage/read 在中继上是死的（要求 ChatGPT 账号登录），
  不是来源，已在 cost.py docstring 写明死胡同
- app-server 每上游补全发 thread/tokenUsage/updated，last 是该次
  补全的用量；中继 5 调用回合实测 last 之和等于最后 total
  （input/output/cached/reasoning 四路都对得上）

实现：host.py run_turn 从事件窗口按 threadId+turnId 汇总用量，
重试/goal 各轮累加，dispatch/run JSON 与 goal 用量行透传；
sandbox 三路解析（dispatch JSON 解析改用完整 stdout，顺带修
了长 text 下 failed 被误判 completed 的潜 bug）；worker 每任务
记一条 actual（重试/fallback 用量累加进同一条），无用量时回落
estimated；cost.py 价目表（默认 OpenAI 挂牌价，env 可覆盖，
无价模型 usd 记 None、报表进 unpriced_actual_tokens 而非 0 美元），
cost_records 加 cached_input_tokens 列（SQLite/PG 两支迁移）；
报表与按天行新增 cached_input_tokens/unpriced_actual_tokens。
测试：host 32、cloud 483 全过。

cloud/server.py

@@ -1092,14 +1092,20 @@ class CloudControlPlaneHandler(BaseHTTPRequestHandler):
                 row = conn.execute(
                     "SELECT day, COALESCE(SUM(total_tokens),0) AS t,"
                     " COALESCE(SUM(usd_micros),0) AS u, COUNT(*) AS c,"
-                    " COALESCE(SUM(fallback_count),0) AS f"
+                    " COALESCE(SUM(fallback_count),0) AS f,"
+                    " COALESCE(SUM(cached_input_tokens),0) AS cached,"
+                    " COALESCE(SUM(CASE WHEN source = 'actual'"
+                    " AND usd_micros IS NULL THEN total_tokens"
+                    " ELSE 0 END),0) AS unpriced"
                     " FROM cost_records WHERE project_id = ? AND day = ?"
                     " GROUP BY day",
                     (project_id, day)).fetchone()
                 if row:
                     daily = [{"day": row["day"], "total_tokens": row["t"],
                               "usd_micros": row["u"], "turns": row["c"],
-                              "fallback_count": row["f"]}]
+                              "fallback_count": row["f"],
+                              "cached_input_tokens": row["cached"],
+                              "unpriced_actual_tokens": row["unpriced"]}]
             elif days is not None:
                 try:
                     n = int(days)
@@ -1112,13 +1118,20 @@ class CloudControlPlaneHandler(BaseHTTPRequestHandler):
                 rows = conn.execute(
                     "SELECT day, COALESCE(SUM(total_tokens),0) AS t,"
                     " COALESCE(SUM(usd_micros),0) AS u, COUNT(*) AS c,"
-                    " COALESCE(SUM(fallback_count),0) AS f"
+                    " COALESCE(SUM(fallback_count),0) AS f,"
+                    " COALESCE(SUM(cached_input_tokens),0) AS cached,"
+                    " COALESCE(SUM(CASE WHEN source = 'actual'"
+                    " AND usd_micros IS NULL THEN total_tokens"
+                    " ELSE 0 END),0) AS unpriced"
                     " FROM cost_records WHERE project_id = ? AND day >= ?"
                     " GROUP BY day ORDER BY day",
                     (project_id, cutoff)).fetchall()
                 daily = [{"day": r["day"], "total_tokens": r["t"],
                           "usd_micros": r["u"], "turns": r["c"],
-                          "fallback_count": r["f"]} for r in rows]
+                          "fallback_count": r["f"],
+                          "cached_input_tokens": r["cached"],
+                          "unpriced_actual_tokens": r["unpriced"]}
+                         for r in rows]
         finally:
             try:
                 store._conn.close()