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/src/cmds/triggers.rs

@@ -23,6 +23,7 @@ pub async fn ls(app: &str, mode: OutputMode) -> Result<()> {
         "enabled",
         "dispatch",
         "retry_max",
+        "materialized",
         "created_at",
     ]);
     for t in resp.triggers {
@@ -33,6 +34,7 @@ pub async fn ls(app: &str, mode: OutputMode) -> Result<()> {
             t.enabled.to_string(),
             t.dispatch_mode,
             t.retry_max_attempts.to_string(),
+            t.materialized.to_string(),
             t.created_at.to_rfc3339(),
         ]);
     }