feat(triggers): show a materialized column in pic triggers ls --app (D1)

A materialized copy of an M5 group stateful template (cron/queue/email) now
reads as `materialized = true` — inherited, read-only — distinct from a
hand-authored trigger. Threads a derived `materialized` bool (=
`materialized_from IS NOT NULL`) row → domain → API → CLI, mirroring the
`sealed`/`shared` columns; `list_for_app` SELECTs `materialized_from`. No
migration.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/picloud-cli/tests/triggers.rs

@@ -57,6 +57,7 @@ fn create_kv_and_show_in_ls() {
             "enabled",
             "dispatch",
             "retry_max",
+            "materialized",
             "created_at"
         ]
     );
@@ -67,6 +68,11 @@ fn create_kv_and_show_in_ls() {
         .find(|c| c.get(1).copied() == Some("kv"))
         .unwrap_or_else(|| panic!("kv trigger missing from ls: {stdout}"));
     assert_eq!(row[2], script_id);
+    // D1: a hand-authored trigger is not materialized.
+    assert_eq!(
+        row[6], "false",
+        "an app-authored trigger shows materialized = false"
+    );
 }
 
 #[ignore = "needs DATABASE_URL pointing at a running Postgres"]