fix(codec): CHDT 类字段统一为 SIS 口径 CCLS/CTYP（ACM2-90）

- ChdtXml wire 绑定与 SisWireMapper 映射键改为 CCLS/CTYP（implementation.md「动态运行事件」）
- 新增 V2 迁移将自有 PG FLIGHT_CHUTE 列 chcls/chtyp 更名为 ccls/ctyp，不动已发布的 V1
- FlywayMigrationTest 更新迁移链断言并校验更名后列；补 CHDT 解码→合并往返用例

src/main/kotlin/com/gzzn/omms/msgexchange/infra/persistence/jdbc/JdbcPgRepositories.kt

@@ -872,7 +872,7 @@ class JdbcFlightStateRepository(
             "CKDT" to DetailSpec("flight_checkin", listOf("chkc", "ccls", "pcot", "pcct", "cotm", "cctm", "ctyp"), "CKNO"),
             "CLDT" to DetailSpec("flight_belt", listOf("belt", "bcls", "pcot", "pcct", "fbag", "lbag", "btyp"), "CLNO"),
             "PSDT" to DetailSpec("flight_stand_plan", listOf("psst", "stst", "stet"), "PSNO"),
-            "CHDT" to DetailSpec("flight_chute", listOf("chut", "chcls", "pcbt", "pcet", "cbtm", "cetm", "chtyp"), "CHNO"),
+            "CHDT" to DetailSpec("flight_chute", listOf("chut", "ccls", "pcbt", "pcet", "cbtm", "cetm", "ctyp"), "CHNO"),
             "DELY" to DetailSpec("flight_delay", listOf("code", "strt", "dura", "remc"), null),
             "ABTM" to DetailSpec("flight_bridge_op", listOf("abdg", "abop", "aotm"), "ASNO"),
             "CHOT" to DetailSpec("flight_chock_op", listOf("chid", "chst", "chtm"), "CSNO"),