feat!: rename project from xmtdx to easy-tdx

- Package directory: src/xmtdx/ -> src/easy_tdx/
- Import path: from easy_tdx import ...
- pip install easy-tdx
- Add LICENSE (MIT) with upstream attribution (pytdx, xmtdx)
- Add NOTICE with detailed attribution
- Update all examples, tests, scripts, docs
- Bump version to 1.0.0

BREAKING CHANGE: import path changed from `xmtdx` to `easy_tdx`

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

src/easy_tdx/commands/fund_flow.py

@@ -0,0 +1,75 @@
+"""历史资金流向命令 (Category 22)。"""
+
+import struct
+
+from ..codec.volume import _decode_volume
+from ..models.enums import Market
+from ..models.stats import HistoricalFundFlow
+from .base import BaseCommand
+
+
+class GetHistoryFundFlowCmd(BaseCommand[list[HistoricalFundFlow]]):
+    """获取历史日线资金流向序列。"""
+
+    def __init__(self, market: Market, code: str, start: int, count: int) -> None:
+        self.market = market
+        self.code = code.encode("utf-8")
+        self.start = start
+        self.count = count
+
+    def build_request(self) -> bytes:
+        # Header (12 bytes) + Payload (28 bytes) = 40 bytes
+        return struct.pack(
+            "<HIHHHH6sHHHHIIH",
+            0x010C,
+            0x01016408,
+            0x001C,
+            0x001C,
+            0x052D,
+            int(self.market),
+            self.code,
+            22,
+            1,
+            self.start,
+            self.count,
+            0,
+            0,
+            0,
+        )
+
+    def parse_response(self, body: bytes) -> list[HistoricalFundFlow]:
+        # 响应格式：9字节头 + 2字节数量 + 每条记录 36 字节
+        if len(body) < 11:
+            return []
+            
+        (num,) = struct.unpack("<H", body[9:11])
+        pos = 11
+        results = []
+        
+        for _ in range(num):
+            if len(body) < pos + 36:
+                break
+            
+            # 记录格式：4字节日期 + 8个4字节自定义浮点金额
+            # [0]日期, [1..4]流入(超/大/中/小), [5..8]流出(超/大/中/小)
+            raw_data = struct.unpack("<IIIIIIIII", body[pos:pos+36])
+            
+            raw_date = raw_data[0]
+            year = raw_date // 10000
+            month = (raw_date // 100) % 100
+            day = raw_date % 100
+            
+            results.append(HistoricalFundFlow(
+                year=year, month=month, day=day,
+                super_in=_decode_volume(raw_data[1]),
+                large_in=_decode_volume(raw_data[2]),
+                medium_in=_decode_volume(raw_data[3]),
+                small_in=_decode_volume(raw_data[4]),
+                super_out=_decode_volume(raw_data[5]),
+                large_out=_decode_volume(raw_data[6]),
+                medium_out=_decode_volume(raw_data[7]),
+                small_out=_decode_volume(raw_data[8]),
+            ))
+            pos += 36
+            
+        return results