feat(task): 任务中心扫码接单(多端) —— 服务端任务状态机/端口/迁移

- Task 加 task_code/tags/display_priority/claimed_by/claimed_at/doing_at；新增 TaskClaim 流水表。
- TaskService 加 claimed/doing/completed 状态机(claim/start_doing/complete)，grab 并入 claim。
- TaskRepository 加 list_published/get_by_code/update/claim/set_doing + TaskClaimRepository；挂 Database。
- 端口：
  · opc  /tasks/grab-by-code、/tasks/{id}/doing、/tasks/{id}/complete
  · operator POST /tasks(auto task_code) + PATCH /tasks/:id
  · park  /park/api/tasks(大屏展示,含 scan_payload 二维码载荷)
  · training /api/tasks/claim-by-code、/api/tasks/my(小程序 C 端账号→OPC 身份 find-or-create 领单)
- 迁移 0008(tasks 加列 + task_claims)已应用+stamp；seed 补 task_code/tags/grab demo。
- tests/test_task_claim.py(自包含内存库, 状态机+流水+list_published), 直接 async 校验通过。

Co-Authored-By: Claude <noreply@anthropic.com>

app/services/training_admin_bridge.py

@@ -9,6 +9,7 @@
 """
 from __future__ import annotations
 
+import json
 from datetime import datetime, timezone
 
 from app.training import db as tdb
@@ -52,6 +53,16 @@ def list_activities(status: str | None = None) -> list[dict]:
     return rows
 
 
+def create_activity(data: dict) -> dict:
+    row = dict(data)
+    row["id"] = tdb.gen_id("E-")
+    row.setdefault("mode", "offline")
+    row.setdefault("status", "open")
+    row.setdefault("duration_min", 90)
+    tdb.insert("events", row)
+    return tdb.fetch_by_id("events", row["id"])
+
+
 def set_activity_status(event_id: str, status: str) -> dict | None:
     if tdb.fetch_by_id("events", event_id) is None:
         return None
@@ -136,3 +147,68 @@ def create_test(data: dict) -> dict:
     }
     tdb.insert("tests", row)
     return pack_test(tdb.fetch_by_id("tests", row["id"]))
+
+
+def _parse_json(raw):
+    if raw is None:
+        return None
+    if isinstance(raw, (dict, list)):
+        return raw
+    try:
+        return json.loads(raw)
+    except (TypeError, ValueError):
+        return raw
+
+
+# ── 调研（survey_logs 表）─────────────────────────────────────────────────
+
+def list_surveys() -> list[dict]:
+    rows = tdb.list_all("survey_logs", "created_at DESC")
+    return [
+        {
+            "id": r.get("id"),
+            "username": r.get("username"),
+            "source": r.get("source"),
+            "answers": _parse_json(r.get("answers")),
+            "created_at": r.get("created_at"),
+        }
+        for r in rows
+    ]
+
+
+# ── 政策（policy_logs 表）─────────────────────────────────────────────────
+
+def list_policies() -> list[dict]:
+    rows = tdb.list_all("policy_logs", "created_at DESC")
+    return [
+        {
+            "id": r.get("id"),
+            "username": r.get("username"),
+            "answers": _parse_json(r.get("answers")),
+            "policies_count": r.get("policies_count"),
+            "subsidies_count": r.get("subsidies_count"),
+            "loans_count": r.get("loans_count"),
+            "summary": r.get("summary"),
+            "created_at": r.get("created_at"),
+        }
+        for r in rows
+    ]
+
+
+# ── 流程（plan_logs 表）───────────────────────────────────────────────────
+
+def list_plans() -> list[dict]:
+    rows = tdb.list_all("plan_logs", "created_at DESC")
+    return [
+        {
+            "id": r.get("id"),
+            "username": r.get("username"),
+            "region": r.get("region"),
+            "status": r.get("status"),
+            "need_park": r.get("need_park"),
+            "has_staff": r.get("has_staff"),
+            "steps_count": r.get("steps_count"),
+            "created_at": r.get("created_at"),
+        }
+        for r in rows
+    ]