feat(persistence): FLIGHT_SCHD_DISPLAY 兼容视图 + 生产读切明细权威 (ACM2-29 P2-2)

- V1.3.1 迁移：flight_schd_display 视图投影首个/第二个资源与总数（gate1/gate2/
  gate_total、chkc1/chkc2/checkin_total、belt1/belt_total、dely_code/strt），
  完整明细仍在各明细表可查；PG LATERAL 方言，11g 随 P3-B 单独提供
- 生产读路径 mapFlightRow 切 assembleDetailOnly：集合键仅由明细表重建，
  不再回退 V1.2.0 槽位/里程碑列（过渡双读仅保留在 FS7 对拍工具内）
- FlightStateEngine 正确性修复：序号属性 "0" 条目现在正确翻译为显式 Clear
  （原实现 items 非空走 Replace，会存出 GTNO=0 脏明细行）；混入常规条目的
  0 标记 fail fast 拒绝猜测（v2 §4 非法结构显式失败）
- JDBC 用例全部切 v2 写路径（persistNextStates），删除 legacy 写路径断言；
  新增：显示视图投影/替换同步用例、明细级联删除断言、引擎 0 标记语义单测

验证：MSGX_PG_PORT=5433 真实 PG ./gradlew test --rerun-tasks
97 用例 0 失败 0 跳过

src/main/resources/db/migration/V1.3.1__flight_schd_display.sql

@@ -0,0 +1,57 @@
+-- flight-state-design-v2 §8 (ACM2-29 P2-2): compatibility read view.
+-- 提供「首个/第二个资源 + 总数」的运营查询投影；完整明细仍在各明细表可查。
+-- PG 专属语法（LATERAL）；Oracle 11g 方言随 P3-B 单独提供 location。
+
+CREATE OR REPLACE VIEW flight_schd_display AS
+SELECT
+  f.flid,
+  f.fday,
+  f.flno,
+  f.mvin,
+  f.sodt,
+  f.stnd,
+  f.abdg,
+  f.state_version,
+  f.last_message_id,
+
+  g1.gate                          AS gate1,
+  g2.gate                          AS gate2,
+  COALESCE(g_total.cnt, 0)         AS gate_total,
+
+  c1.chkc                          AS chkc1,
+  c2.chkc                          AS chkc2,
+  COALESCE(c_total.cnt, 0)         AS checkin_total,
+
+  b1.belt                          AS belt1,
+  COALESCE(b_total.cnt, 0)         AS belt_total,
+
+  dly.code                         AS dely_code,
+  dly.strt                         AS dely_strt
+FROM flight_schd f
+LEFT JOIN LATERAL (
+  SELECT gate FROM flight_gate WHERE flid = f.flid ORDER BY ordinal LIMIT 1 OFFSET 0
+) g1 ON TRUE
+LEFT JOIN LATERAL (
+  SELECT gate FROM flight_gate WHERE flid = f.flid ORDER BY ordinal LIMIT 1 OFFSET 1
+) g2 ON TRUE
+LEFT JOIN LATERAL (
+  SELECT count(*) AS cnt FROM flight_gate WHERE flid = f.flid
+) g_total ON TRUE
+LEFT JOIN LATERAL (
+  SELECT chkc FROM flight_checkin WHERE flid = f.flid ORDER BY ordinal LIMIT 1 OFFSET 0
+) c1 ON TRUE
+LEFT JOIN LATERAL (
+  SELECT chkc FROM flight_checkin WHERE flid = f.flid ORDER BY ordinal LIMIT 1 OFFSET 1
+) c2 ON TRUE
+LEFT JOIN LATERAL (
+  SELECT count(*) AS cnt FROM flight_checkin WHERE flid = f.flid
+) c_total ON TRUE
+LEFT JOIN LATERAL (
+  SELECT belt FROM flight_belt WHERE flid = f.flid ORDER BY ordinal LIMIT 1 OFFSET 0
+) b1 ON TRUE
+LEFT JOIN LATERAL (
+  SELECT count(*) AS cnt FROM flight_belt WHERE flid = f.flid
+) b_total ON TRUE
+LEFT JOIN LATERAL (
+  SELECT code, strt FROM flight_delay WHERE flid = f.flid ORDER BY ordinal LIMIT 1
+) dly ON TRUE;