锁仓上限改为可配置，默认3次不变，止盈按钮左侧增加修改入口

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ft-app/app/seed.py

@@ -27,8 +27,24 @@ SEED_BARS: list[dict] = [
     {"date": "2026-07-24", "open": 900, "close": 908, "high": 912, "low": 891},
 ]
 
+def _migrate(engine):
+    """Add missing columns to existing tables (SQLite doesn't auto-migrate)."""
+    import sqlite3
+    conn = engine.raw_connection()
+    try:
+        cur = conn.cursor()
+        cur.execute("PRAGMA table_info(rounds)")
+        cols = {row[1] for row in cur.fetchall()}
+        if "max_locks" not in cols:
+            cur.execute("ALTER TABLE rounds ADD COLUMN max_locks INTEGER DEFAULT 3")
+        conn.commit()
+    finally:
+        conn.close()
+
+
 def seed():
     Base.metadata.create_all(bind=engine)
+    _migrate(engine)
     db = SessionLocal()
 
     try: