feat: enhance trading bot functionality and documentation

- Updated README.md to reflect new features including dynamic margin ratio, model hot-reload, and multi-symbol streaming.
- Modified bot logic to ensure raw signals are passed to the `_close_and_reenter` method, even when the ML filter is loaded.
- Introduced a new script `run_tests.sh` for streamlined test execution.
- Improved test coverage for signal processing and re-entry logic, ensuring correct behavior under various conditions.

scripts/run_tests.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+# 전체 테스트 실행 스크립트
+#
+# 사용법:
+#   bash scripts/run_tests.sh           # 전체 실행
+#   bash scripts/run_tests.sh -k bot    # 특정 키워드 필터
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+
+VENV_PATH="${VENV_PATH:-$PROJECT_ROOT/.venv}"
+if [ -f "$VENV_PATH/bin/activate" ]; then
+    # shellcheck source=/dev/null
+    source "$VENV_PATH/bin/activate"
+else
+    echo "경고: 가상환경을 찾을 수 없습니다 ($VENV_PATH). 시스템 Python을 사용합니다." >&2
+fi
+
+cd "$PROJECT_ROOT"
+
+python -m pytest tests/ \
+    --ignore=tests/test_database.py \
+    -v \
+    "$@"