feat(strategy-map): A3 三维切片（时间/门店/产品）——切片重算 + 显式空态 + entity 隔离

- 新增 /api/cma/maps/{id}/dimension-options 与 /{id}/slice（只读）
- 时间：kpi_values.period 月/季/年；flow 求和、ratio 均值、balance/status 取最新
- 产品：product_sales + 逐月源一致性闸门（偏差>1% 不切片）
- 门店：库内无门店级事实 ⇒ available=false + reason，绝不回退总额
- 前端 MapDimensionFilter 挂到 MapCanvas，切换即 emit 切片，清除恢复 /review

backend/scripts/_a3_selftest.py

@@ -0,0 +1,46 @@
+# -*- coding: utf-8 -*-
+"""A3 自测：直接调 build_slice（不启服务），校验真实库切片与空态。"""
+import os, sys, json
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+for line in open('/root/cma-management/backend/.env'):
+    line = line.strip()
+    if '=' in line and not line.startswith('#') and line.split('=')[0].startswith(('CMA_DB', 'ERP_DB')):
+        k, v = line.split('=', 1); os.environ.setdefault(k, v)
+
+from app.database import get_session_local
+from app.api.map_dimensions import build_slice, _time_options, _store_options, _product_options
+
+db = get_session_local()()
+
+def brief(r):
+    print("slice:", r["slice"], "| empty:", r["empty"], "|", r["empty_reason"])
+    for o in r["objectives"]:
+        ks = [f'{k["kpi_code"]}={k["actual_value"]}/{k["target_value"]}@{k["achievement_pct"]}%({k["level"]},{k["aggregation"]}){"" if k["available"] else "[空:"+str(k["reason"])[:36]+"]"}' for k in o["kpis"]]
+        if ks:
+            print("  ", o["dimension_key"], o["name"], "|", "; ".join(ks))
+
+print("=== 1) 2026-08 月切片 (map 65)")
+brief(build_slice(db, 1, 65, "2026-08", None, None))
+print("\n=== 2) 2026-Q3 季切片")
+brief(build_slice(db, 1, 65, "2026-Q3", None, None))
+print("\n=== 3) 2026 年切片")
+brief(build_slice(db, 1, 65, "2026", None, None))
+print("\n=== 4) 产品切片 酣客酱酒 @2026-08")
+brief(build_slice(db, 1, 65, "2026-08", None, "酣客酱酒"))
+print("\n=== 5) 产品切片 不存在产品 @2026-08")
+brief(build_slice(db, 1, 65, "2026-08", None, "不存在的产品X"))
+print("\n=== 6) 门店切片 一店 @2026-08")
+brief(build_slice(db, 1, 65, "2026-08", "一店", None))
+print("\n=== 7) entity 隔离: map65 + entity2")
+try:
+    build_slice(db, 2, 65, "2026-08", None, None)
+    print("FAIL 未拦截")
+except Exception as e:
+    print("OK 拦截:", type(e).__name__, getattr(e, "status_code", ""), getattr(e, "detail", e))
+
+print("\n=== 8) options map65")
+o = build_slice(db, 1, 65, None, None, None)
+print("time dims:", json.dumps(o["dims"]["time"], ensure_ascii=False)[:300])
+print("store:", json.dumps(o["dims"]["store"], ensure_ascii=False)[:300])
+print("product:", json.dumps(o["dims"]["product"], ensure_ascii=False)[:300])
+db.close()