feat: add portfolio snapshot read layer

trex_core/runtime/config.py

@@ -48,6 +48,14 @@ class RabbitMQConfig:
     timeout: float = 5.0
 
 
+@dataclass(frozen=True)
+class SnapshotScheduleConfig:
+    """Daily snapshot refresh schedule (REQ-030)."""
+
+    kst_time: str = "07:30"
+    tick_sec: float = 60.0
+
+
 @dataclass(frozen=True)
 class DaemonConfig:
     dsn: str
@@ -62,6 +70,8 @@ class DaemonConfig:
     # REQ-022 (BAT-007): RabbitMQ transport config. Required by the new
     # sync+thread daemon — HTTP API has been removed (REQ-025).
     rabbitmq: Optional[RabbitMQConfig] = None
+    # REQ-030 (BAT-008): daily snapshot refresh.
+    snapshot_schedule: SnapshotScheduleConfig = SnapshotScheduleConfig()
 
     @staticmethod
     def from_env() -> "DaemonConfig":
@@ -98,6 +108,10 @@ class DaemonConfig:
                 url=mq_url,
                 timeout=float(os.environ.get("TREX_RABBITMQ_TIMEOUT", "5")),
             )
+        snapshot_schedule = SnapshotScheduleConfig(
+            kst_time=os.environ.get("TREX_SNAPSHOT_SCHEDULE_KST", "07:30").strip() or "07:30",
+            tick_sec=float(os.environ.get("TREX_SNAPSHOT_TICK_SEC", "60")),
+        )
         return DaemonConfig(
             dsn=dsn,
             total_slots=int(os.environ.get("TREX_TOTAL_SLOTS", "10")),
@@ -107,4 +121,5 @@ class DaemonConfig:
             portfolio_hub=portfolio_hub,
             ledger_interval_sec=float(os.environ.get("TREX_LEDGER_INTERVAL_SEC", "1.0")),
             rabbitmq=rabbitmq,
+            snapshot_schedule=snapshot_schedule,
         )