feat(config): config 디렉터리 기반 설정 관리 (--config-path/--env-file, trex-orb-v1 정합, BAT-026)

REQ-048/010 change-req. `--config` 를 이름으로 해석 + `--config-path <dir>`
(기본 ./config) + resolve_config_toml(슬래시 포함 값은 하위호환 명시 경로).
`.env` 를 config-dir 결정적 해석(--env-file 우선, 없으면 <config_dir>/.env,
CWD 무관) + config/.env.example + .gitignore config/* 허용목록. 운영자 CLI 도
--config-path/--env-file 동일 적용. from_env() legacy 루트 .env 폴백 유지로
완전 하위호환.

단위 23 + 전체 375 passed, ruff clean, 라이브 스모크(name·path 동일).
REQ-048/010 → Implemented.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

trex_core/runtime/daemon.py

@@ -66,7 +66,7 @@ from trex_core.application.preallocation_scheduler import DailyPreallocationSche
 from trex_core.application.snapshot_scheduler import SnapshotScheduler
 from trex_core.application.watchdog import WatchdogStore
 from trex_core.domain.slot import SlotService
-from trex_core.runtime.config import DaemonConfig
+from trex_core.runtime.config import DaemonConfig, resolve_config_toml
 
 _log = logging.getLogger(__name__)
 
@@ -375,11 +375,21 @@ def main() -> None:  # pragma: no cover - process entrypoint
     parser = argparse.ArgumentParser(prog="trex-core-daemon")
     parser.add_argument(
         "--config", required=True,
-        help="per-instance TOML config path (instance_key, portfolio_hub_token). "
-             "Required — no default (REQ-048 / dcy-009 OQ-2).",
+        help="per-instance TOML name (resolved within --config-path) or explicit "
+             "path. Required — no default (REQ-048 / dcy-009 OQ-2).",
+    )
+    parser.add_argument(
+        "--config-path", default=None,
+        help="config directory (default ./config) for --config name resolution "
+             "and the matching .env (REQ-048/010 CHG-20260609-01).",
+    )
+    parser.add_argument(
+        "--env-file", default=None,
+        help="explicit .env path; overrides <config-dir>/.env (REQ-010 CHG-20260609-01).",
     )
     args = parser.parse_args()
-    config = DaemonConfig.from_config(args.config)
+    toml_path = resolve_config_toml(args.config, args.config_path)
+    config = DaemonConfig.from_config(toml_path, env_file=args.env_file)
     Daemon(config).run()