prepare fastapi root layout for server deployment

scripts/drop_legacy_tables.py

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+from __future__ import annotations
+
+import sys
+from pathlib import Path
+
+from sqlalchemy import inspect, text
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
+
+from app.db.session import SessionLocal
+
+LEGACY_TABLES = [
+    "evaluation_report_exports",
+    "evaluation_records",
+    "session_submissions",
+    "session_orders",
+    "session_runtime_messages",
+    "training_sessions",
+    "case_exam_items",
+    "rubric_templates",
+    "cases",
+]
+
+
+def main() -> None:
+    """旧表清理：在新表链路验证通过后删除不再被业务依赖的旧表。"""
+    with SessionLocal() as db:
+        existing = set(inspect(db.bind).get_table_names()) if db.bind else set()
+        dialect = db.bind.dialect.name if db.bind else ""
+        if dialect == "mysql":
+            db.execute(text("SET FOREIGN_KEY_CHECKS=0"))
+        for table_name in LEGACY_TABLES:
+            if table_name in existing:
+                db.execute(text(f"DROP TABLE `{table_name}`"))
+                print(f"dropped legacy table: {table_name}")
+        if dialect == "mysql":
+            db.execute(text("SET FOREIGN_KEY_CHECKS=1"))
+        db.commit()
+    print("legacy table cleanup completed")
+
+
+if __name__ == "__main__":
+    main()