工作台重命名：无界·无界 → 学会·无界

- ALL_TENANTS / session / seed / migrations 全部同步
- 新增 migrate_rename_tenant() 数据迁移，启动自动 UPDATE 所有表
- migrations/ 模式重构（参考 SalesManager）

backend/flask_app.py

@@ -61,7 +61,7 @@ def admin_required(f):
     return decorated
 
 
-ALL_TENANTS = ["科普·无界", "科研·无界", "医患·无界", "MCN·无界", "无界·无界"]
+ALL_TENANTS = ["科普·无界", "科研·无界", "医患·无界", "MCN·无界", "学会·无界"]
 
 @app.route("/login")
 def login_page():
@@ -84,7 +84,7 @@ def auth_login():
         session["role"] = user["role"]
         # 管理员可看所有工作台，OPC负责人看分配的工作台
         if user["role"] == "admin":
-            session["tenants"] = ["科普·无界", "科研·无界", "医患·无界", "MCN·无界", "无界·无界"]
+            session["tenants"] = ["科普·无界", "科研·无界", "医患·无界", "MCN·无界", "学会·无界"]
         else:
             ut = rows(conn, "SELECT tenant FROM user_tenants WHERE user_id=?", (user["id"],))
             session["tenants"] = [x["tenant"] for x in ut]
@@ -487,7 +487,7 @@ def init_db():
         _exec(conn, """INSERT INTO users (username, password_hash, display_name, role, created_at) VALUES (?,?,?,?,?)""",
             ("wuji", generate_password_hash("wuji123", "pbkdf2:sha256"), "无界负责人", "opc_owner", date.today().isoformat()))
         # 各 OPC 负责人绑定工作台
-        for uname, tenant in [("kepu","科普·无界"),("keyan","科研·无界"),("yihuan","医患·无界"),("mcn","MCN·无界"),("wuji","无界·无界")]:
+        for uname, tenant in [("kepu","科普·无界"),("keyan","科研·无界"),("yihuan","医患·无界"),("mcn","MCN·无界"),("wuji","学会·无界")]:
             u = one(conn, "SELECT id FROM users WHERE username=?", (uname,))
             if u:
                 _exec(conn, "INSERT INTO user_tenants (user_id, tenant) VALUES (?,?)", (u["id"], tenant))
@@ -1049,8 +1049,9 @@ def health():
     return jsonify({"ok": True, "service": "opc-manager"})
 
 
-init_db()
-seed_db()
+from migrations import run_migrations
+
+run_migrations()
 
 
 if __name__ == "__main__":