feat: add get_board_ranking() for board change-pct ranking

New MacClient/AsyncMacClient method that ranks all boards of a given
type (industry/concept) by change_pct, amount, main_net_amount, or vol.
Aggregates member quotes via get_board_summary() for each board.

Also bumps version to 1.3.0 and updates README + CLI version.

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

examples/15_mac_board/board_ranking.py

@@ -0,0 +1,48 @@
+"""演示：板块涨跌幅排行榜。
+
+通过 MacClient 的 get_board_ranking() 获取行业或概念板块的聚合排行数据，
+包含涨跌幅、成交额、成交量、主力净流入、涨跌家数等。
+
+board_type 参数:
+    BoardType.HY  — 行业板块
+    BoardType.GN  — 概念板块
+
+返回 DataFrame 列:
+    code             板块代码
+    name             板块名称
+    change_pct       涨跌幅%
+    amount           板块总成交额（元）
+    vol              板块总成交量（股）
+    main_net_amount  板块主力净流入（元）
+    up_count         上涨家数
+    down_count       下跌家数
+    member_count     成分股数量
+"""
+
+from easy_tdx import MacClient
+from easy_tdx.mac.enums import BoardType
+
+with MacClient.from_best_host() as c:
+    # 行业板块涨幅
+    print("=== 行业板块涨幅 ===")
+    df_hy = c.get_board_ranking(BoardType.HY, top_n=300, sort_by="change_pct")
+    print(df_hy.to_string(index=False))
+
+    print()
+
+    # 概念板块主力净流入
+    print("=== 概念板块主力净流入 ===")
+    df_gn = c.get_board_ranking(BoardType.GN, top_n=300, sort_by="main_net_amount")
+    print(df_gn.to_string(index=False))
+
+# 运行结果示例:
+# === 行业板块涨幅 ===
+#  code   name  change_pct        amount          vol  ...
+#  881127 通信设备        3.25  18523456000  1234567890  ...
+#  881156 半导体          2.98  25678900000  2345678901  ...
+#  ...
+#
+# === 概念板块主力净流入 ===
+#  code   name  change_pct        amount          vol  ...
+#  880952 人工智能        1.56  42345678000  3456789012  ...
+#  880930 芯片概念        1.23  38765432000  2987654321  ...