feat: 离线 fixture 测试、unknown 字段探测脚本、高可用传输层

- tests/fixtures/：录制 12 条命令真实响应 body（hex），配套 json 预期值
- tests/unit/test_commands_offline.py：13 个离线 pytest，无需网络，验证
  各命令解析正确性及所有已知 bug 修复（#1~#5）
- scripts/probe_unknowns.py：对比 unknown_1/2/3/5~8 与均价、涨停价等假设，
  输出相关性分析报告，供后续字段逆向使用
- transport/sync.py：新增 ping_host()、ping_all()（并发测速）、KNOWN_HOSTS
- client.py：TdxClient.from_best_host() 工厂方法（自动优选最低延迟服务器）、
  TdxClient.ping_all() 静态代理、_execute() 断线自动重连（重试一次）
- 修复 GetTransactionDataCmd.parse_response 多余 skip 参数调用

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/fixtures/company_info_category.hex

@@ -0,0 +1 @@
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

tests/fixtures/company_info_category.json

@@ -0,0 +1,8 @@
+{
+  "num_records": 16,
+  "first": {
+    "filename": "600000.txt",
+    "start": 0,
+    "length": 11426
+  }
+}

tests/fixtures/company_info_content.json

@@ -0,0 +1,4 @@
+{
+  "length": 8070,
+  "prefix": "☆最新提示☆ ◇600000 浦发银行 更新日期：2026-04-10◇ 港澳资讯 灵通V9.0\r\n"
+}

tests/fixtures/finance_info.hex

@@ -0,0 +1 @@
+0100013630303030305f484b4a10000100eb253501460a31015f484b4a00c0f5444aa42c4c86d6224d00000000000000005c8fc23fcf3a1650000000009138814ce8a30c4b400b1d4800000000c05ee54a643b004d79c4424eaee7254d948fe54c00000000907f4c4cf4f4934b6b36b34d48e26e4c000000000c9b4b4ca247404cbacc3e4c44566f4d3d0ab14100004041

tests/fixtures/finance_info.json

@@ -0,0 +1,5 @@
+{
+  "liutong_guben": 33305837500.0,
+  "zong_guben": 33305837500.0,
+  "meigujing_zichan": 22.1299991607666
+}

tests/fixtures/history_minute_time.hex

@@ -0,0 +1 @@
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

tests/fixtures/history_minute_time.json

@@ -0,0 +1,7 @@
+{
+  "num_records": 240,
+  "first": {
+    "price": 10.29,
+    "vol": 10044
+  }
+}

tests/fixtures/history_transaction.hex

@@ -0,0 +1 @@
+0a00ec512441800386103200008003411301008003009d0401008003003001008003009d02010080034183020100800301b50202008003411e0100810300170100840302a07b0200

tests/fixtures/history_transaction.json

@@ -0,0 +1,9 @@
+{
+  "num_records": 10,
+  "first": {
+    "hour": 14,
+    "minute": 56,
+    "price": 10.3,
+    "vol": 50
+  }
+}

tests/fixtures/minute_time.hex

@@ -0,0 +1 @@
+f0000000013630303030303e109d0f04040643acfaa60edd0f9889349483013a6ec94da7831cb2851841a6e2020001bd0788124102a8cd0187314203906aab11560fa00f9f01ae920144d203a9a30201f8019bf6010201be2d0009a346410cbd7e020ba33a4104bf37000593210204b51e000f8d400005aa150008b02d4107843a4101821101049a240005ba32410186150103bb1e0101b50b420598580001833e0203b53e0003881a0001af060002ac0e000c8c5700059c3d4101b20c0101b10a41029c280102a31f0002861c00008d054102962000018215010187190001b0260001af11000193164101a7264100a5200000b9320040a12c4140a60c0040bf0801409014424a95e0010141bd1b0042ba330141b41c4140ae030141a7150040a10e41428d320041b71a4141ae0b0141aa09004198140043bc434141bc1b0141841900418c0e0041ba164141a9130141bd160041ad1c00438c360041a40c414189124147a37d0142a01d00419a1c014094070040a8044140a70a00408c0700409f060140ab0841408d0b0040b4120140850b0040ac130040a7050040a60b4140950a0140990441408b0a0140b3094140800d01409a064140bc090141be430040b1110041be1f00408c07004081160040810d01008d05414082200042b13200408e0500409f080040960b4140bf070042843b00409c040140ba090040bd050040af110040ae0400408907004098050040b80d0041bb1e414088050140930a0040a0064142802e0040910b014182364144b36b0041a30c4141870c0140a9080040860b41418e160140bd0a0040a40d4142803201408c0a41408d0b0140880600418a1f0140960d0040ac0801409b184140b812004099090040b204004087084140a7060140b8020040b4064141a62d0140b3024140970301408c044140aa0f0040af0a0240a8370000af1b4100bd080100a1024100a5040040a22e0040810441408d0a00408e0a0140ad0d004094120040ae06414094100140890541409c0a0140bb0b4140a0060040bd0b0040aa140140b3100100a32101008f2542008b170000aa06010099030100b911000094100000900600018d114101be180101a20f0100940a0000be050000a5040001ac164101a01400028b32000086070000ae030000b31b0000940641009a1a01009b080000890a0000b10a0000b6094100a00700009f214140ae040000b90b0040ac4a41418618024082184140962201009b044140920c01009a0d4140a6250040ae100100af1000008d050000890500009f0e0040b81400008a090000a1150000b40a0000bb080000a5060001983800409a0e0000ad0f4141bd5e0040801c0040961600409b120040b025004092130040bc150040851e414092160040ad1e01408f15004090254140941d0141802d41458fde0101001d0000004143948301

tests/fixtures/minute_time.json

@@ -0,0 +1,8 @@
+{
+  "num_records": 240,
+  "first": {
+    "price": 0.01,
+    "vol": 48,
+    "unknown_1": 54
+  }
+}

tests/fixtures/security_bars.hex

@@ -0,0 +1 @@
+0500332635018aa001c20200ea0253fb1c4c32f1c64d3726350100cc0232ea02bc82104c573fb54d38263501149a01ae01721025384c2b39e74d3926350154cc0232cc02d2d52f4c4a73db4d3a263501006814c601a7ba224c3a6ec94d

tests/fixtures/security_bars.json

@@ -0,0 +1,10 @@
+{
+  "num_records": 5,
+  "first": {
+    "open": 10.25,
+    "high": 10.25,
+    "low": 10.08,
+    "close": 10.12,
+    "vol": 41151820.0
+  }
+}

tests/fixtures/security_count.hex

@@ -0,0 +1 @@
+0569

tests/fixtures/security_count.json

@@ -0,0 +1,3 @@
+{
+  "count": 26885
+}

tests/fixtures/security_list.json

@@ -0,0 +1,8 @@
+{
+  "num_records": 1000,
+  "first": {
+    "code": "999999",
+    "name": "上证指数",
+    "pre_close": 11654847.33
+  }
+}

tests/fixtures/security_quotes.hex

@@ -0,0 +1 @@
+01050100013630303030303e109d0f04040643acfaa60edd0f9889349483013a6ec94da7831cb2851841a6e2020001bd0788124102a8cd0187314203906aab114304a7b4018f1f4405ab96019812560f0000000000003e10

tests/fixtures/security_quotes.json

@@ -0,0 +1,9 @@
+{
+  "num_records": 1,
+  "first": {
+    "code": "600000",
+    "pre_close": 9.93,
+    "unknown_2": -1,
+    "unknown_3": 22694
+  }
+}

tests/fixtures/transaction.hex

@@ -0,0 +1 @@
+0a0083039e0f0000080083030000000800830300000008008303000000080083030000000800830300000008008303410000080083030000000800830300000008008403009483019f040200

tests/fixtures/transaction.json

@@ -0,0 +1,9 @@
+{
+  "num_records": 10,
+  "first": {
+    "hour": 14,
+    "minute": 59,
+    "price": 9.9,
+    "vol": 0
+  }
+}

tests/fixtures/xdxr_info.json

@@ -0,0 +1,9 @@
+{
+  "num_records": 87,
+  "first": {
+    "year": 1999,
+    "month": 11,
+    "day": 10,
+    "category": 5
+  }
+}