feat: v1.1.0 - MAC protocol, CLI tool, extended markets, unified client

- Add MacClient/AsyncMacClient with full MAC protocol support (quotes, kline
  with adjustment, tick charts, transactions, boards, capital flow, auction,
  unusual, symbol info, server info)
- Add MacExClient/AsyncMacExClient for extended markets (HK, US, futures)
- Add UnifiedTdxClient auto-routing between A-share and extended markets
- Add `easy-tdx` CLI tool with JSON default output, Agent-friendly
- Add field bitmap protocol for custom quote field selection
- Fix quote-list missing fields (default to BASIC+VOLUME preset)
- Add config.py with centralized host management and auto-discovery
- Add 50+ examples covering all APIs (01-20)
- Rewrite README with CLI-first, Agent-friendly documentation
- Bump version to 1.1.0

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

examples/12_mac_kline/kline_offset.py

@@ -0,0 +1,23 @@
+"""演示：K 线偏移信息。
+
+通过 MacClient 的 get_kline_offset() 获取 K 线数据的偏移量信息，用于确定当前可用
+K 线总数和数据偏移位置。通常用于确认服务器上的 K 线数据总量。
+
+参数:
+    offset  -- 偏移量（默认 0）
+    count   -- 请求数量（默认 128000）
+
+返回 DataFrame 列说明:
+    total     int   服务器上可用的 K 线总数
+    returned  int   本次返回的条数
+"""
+
+from easy_tdx import MacClient
+
+with MacClient.from_best_host() as c:
+    df = c.get_kline_offset()
+    print(df.to_string(index=False))
+
+# 运行结果:
+#  total  returned
+# 128000         2