feat(sntp): 板端 SNTP 校时接入——coreSNTP 序列化器 + [sntp] 段 + 设置页（#73）

- vendored coreSNTP v2.0.0 序列化器（MIT，仅 serializer+LICENSE，零堆），
  48 字节报文编解码在库，节奏与准入判据在本方（RFC 4330 §10 调研口径）
- App/sync/time_sntp.c 挂 timeSyncTask 的 8888 事件循环，等待切片 ≤50 ms，
  不饿任务狗与 IWDG；懒建 UDP socket，代际变化/禁用/死错误码即关闭归还
- 防伪 = OriginTimestamp 逐位等于发出时 T1（含低 16 位随机小数位）；
  mode/stratum/闰秒指示/KoD 按 RFC 拒收；DENY·RSTR 换服务器、RATE 只退避
- 主备轮换 + 失败指数退避（5 s 起、60 s 封顶）+ 首轮 1~5 分钟随机错峰；
  成功恢复 poll_min 周期（1~1440 分，出厂默认 60，默认不启用不发包）
- 钟面 = 本地时间：UTC+8 固定偏移落 sys_clock_set_unix（§1.1 时基裁定，
  第三个写入口，装置仍不存时区）；|offset|<2 s 只记日志不步进，冷启动或
  更大偏差步进并回写 SD2506，留痕 [SNTP] step 与 syslog OPER
- 首个校验通过的同步置 SYS_EVT_TIMESYNC_READY（就绪位，消费方按需 NoClear）
- [sntp] 配置段（enable/server1/server2/poll_min）属主 sntp_cfg.c，
  注册在 net_cfg_load()；UI 页 31「SNTP 设置」（密码叶）：启用开关 +
  主/备服务器 octet 编辑 + 周期(分) + 保存，复用 net_cfg_save_request 链
- 测试与门禁：test/host/sntp 新套件（报文/防伪/KoD/退避周期/阶跃域/配置
  注册表）、net_cfg 与 time_sync 套件补 fake、黄金参考 66→74 张零漂移、
  字符集 228 字、Keil 0 错 0 警（RO +5,848 B 含字体）、覆盖率基线回填
- 文档：墙钟维护说明 §16、网络配置说明 [sntp] 节、配置文件设计说明变更记录、
  产品需求 FR-TIME-3 与 8.3/9.1.2 台账、UI 补齐规划/UI补齐 31 叶口径、
  登记簿销项并登记「SNTP 校时真机判据」等台架（PC 时间源 192.168.31.161/.13）

scripts/board_ui_nav.py

@@ -1247,7 +1247,7 @@ def selftest_board_frames(clf):
 
 
 def selftest_refs(clf):
-    """仓库黄金参考（66 张）逐帧分类自检：每张图的期望值 = 它的文件名。
+    """仓库黄金参考（74 张）逐帧分类自检：每张图的期望值 = 它的文件名。
 
     这一组是**语义正确的基线**（模拟器与板端同一份 UI 源码），用来把"分类器错了"与
     "留档帧本来就是走歪的"分开——两类失败含义完全不同，混在一起就只能靠猜。

scripts/check_registration.py

@@ -105,6 +105,7 @@ SIM_EXEMPT = [
     ("App/fs/vol_idle_sync.c", "MCU 存储属主后台空闲同步（FatFs disk_ioctl + 卷锁 + sys_events），主机侧纯逻辑单测覆盖于 test/host/vol_idle_sync/，模拟器无消费路径"),
     ("App/log/console_log.c", "MCU 控制台输出，模拟器无消费路径"),
     ("App/sync/time_sync.c", "对时任务（net+RTOS），MCU 专属"),
+    ("App/sync/time_sntp.c", "SNTP 校时客户端（net+RTOS+sys_clock 依赖，2026-11-04 立项落地），MCU 专属；主机侧纯逻辑单测覆盖于 test/host/sntp"),
     ("App/task/adc_task.c", "固件 FreeRTOS 任务，模拟器不跑固件任务"),
     ("App/task/default_task.c", "固件 FreeRTOS 任务，模拟器不跑固件任务"),
     ("App/task/iec104_serv.c", "固件 FreeRTOS 任务（104 上行，B4），模拟器不跑固件任务"),

scripts/ram_baseline.py

@@ -85,6 +85,7 @@ def subsystem_of(obj):
                      "task_prof", "boot_stats", "vol_idle_sync",
                      "sys_", "cfg_", "dbg_", "console_log", "task_watchdog",
                      "sha256", "tpafe", "sd2506", "test_task", "time_sync",
+                     "time_sntp",
                      "default_task")):
         return "应用"
     return "其它"

scripts/ram_baseline.tsv

@@ -16,4 +16,4 @@ date	code	ro	rw	zi	er_irom1	er_pct	iram1	iram1_pct	ccm	ccm_pct	top_rwzi
 2026-10-30	246720	29836	2052	149708	276556	26.4	94336	72.0	57376	87.9	heap_4.o=57376;lv_mem_core_builtin.o=16384;lftpd.o=7884;ui_net_sink.o=6770;ui_port.o=6432;nand_ftl.o=6216;wave_ring.o=5296;sb_link.o=4376;ch395f.o=4162;console_log.o=4132
 2026-11-02	247548	29836	2052	149740	277384	26.5	94368	72.0	57376	87.9	heap_4.o=57376;lv_mem_core_builtin.o=16384;lftpd.o=7884;ui_net_sink.o=6802;ui_port.o=6432;nand_ftl.o=6216;wave_ring.o=5296;sb_link.o=4376;ch395f.o=4162;console_log.o=4132
 2026-11-03	249112	29836	2052	149996	278948	26.6	94624	72.2	57376	87.9	heap_4.o=57376;lv_mem_core_builtin.o=16384;lftpd.o=7884;ui_net_sink.o=6802;ui_port.o=6432;nand_ftl.o=6216;wave_ring.o=5296;sb_link.o=4376;ch395f.o=4162;console_log.o=4132
-2026-11-04	249120	29836	2052	149996	278956	26.6	94624	72.2	57376	87.9	heap_4.o=57376;lv_mem_core_builtin.o=16384;lftpd.o=7884;ui_net_sink.o=6802;ui_port.o=6432;nand_ftl.o=6216;wave_ring.o=5296;sb_link.o=4376;ch395f.o=4162;console_log.o=4132
+2026-11-04	254648	30152	2072	150088	284800	27.2	94736	72.3	57376	87.9	heap_4.o=57376;lv_mem_core_builtin.o=16384;lftpd.o=7884;ui_net_sink.o=6802;ui_port.o=6432;nand_ftl.o=6216;wave_ring.o=5296;sb_link.o=4376;ch395f.o=4162;console_log.o=4132

scripts/size_attestation.json

@@ -1,25 +1,25 @@
 {
-  "built_at": "2026-11-04T09:25:23+08:00",
-  "fingerprint": "2f112c1679d6145a49f70f6f208ade9a1e4fa573aad3cacdaa98b0ed2aac6855",
-  "fingerprint_files": 1468,
+  "built_at": "2026-11-04T16:13:16+08:00",
+  "fingerprint": "b17ef8ac89e3f05d556ab890b1e0cc29c45f77c5739449187de0e5d3e4314b3a",
+  "fingerprint_files": 1479,
   "fingerprint_source": "git-index",
   "gated_regions": [
     "RW_IRAM1",
     "RW_CCM"
   ],
-  "git_head": "f10bb8df659e201efbacf04978c7442493fe94df",
+  "git_head": "912c16b75744cd0679b4f489696c02867d4b6f7a",
   "map": "MDK-ARM/STM32F407-Demo/STM32F407-Demo.map",
-  "map_mtime": 1793753528,
+  "map_mtime": 1793779933,
   "pct": {
-    "ER_IROM1": 26.6,
+    "ER_IROM1": 27.16,
     "RW_CCM": 87.89,
-    "RW_IRAM1": 72.19,
+    "RW_IRAM1": 72.28,
     "UNINIT_CCM": 18.75
   },
   "regions": {
     "ER_IROM1": {
       "max": 1048576,
-      "size": 278956
+      "size": 284800
     },
     "RW_CCM": {
       "max": 65280,
@@ -27,7 +27,7 @@
     },
     "RW_IRAM1": {
       "max": 131072,
-      "size": 94624
+      "size": 94736
     },
     "UNINIT_CCM": {
       "max": 256,
@@ -37,10 +37,10 @@
   "schema": 2,
   "scope_note": "\u540c\u7801\u51ed\u8bc1\uff1a\u6307\u7eb9\u8986\u76d6\u56fa\u4ef6\u4f53\u79ef\u76f8\u5173\u6e90\u7801\uff0c\u53e3\u5f84\u89c1\u672c\u811a\u672c docstring",
   "sizes": {
-    "code": 249120,
-    "ro_data": 29836,
-    "rw_data": 2052,
-    "zi_data": 149996
+    "code": 254648,
+    "ro_data": 30152,
+    "rw_data": 2072,
+    "zi_data": 150088
   },
   "threshold_pct": 92.0,
   "worktree_dirt_at_stamp": 0,

scripts/test_coverage_baseline.json

@@ -208,13 +208,21 @@
       "lines_covered": 227,
       "lines_valid": 255
     },
+    "App/sync/time_sntp.c": {
+      "func_rate": 1.0,
+      "funcs_covered": 18,
+      "funcs_valid": 18,
+      "line_rate": 0.9153,
+      "lines_covered": 227,
+      "lines_valid": 248
+    },
     "App/sync/time_sync.c": {
       "func_rate": 1.0,
       "funcs_covered": 4,
       "funcs_valid": 4,
       "line_rate": 1.0,
-      "lines_covered": 100,
-      "lines_valid": 100
+      "lines_covered": 101,
+      "lines_valid": 101
     },
     "App/task/iec104_serv.c": {
       "func_rate": 0.75,
@@ -369,12 +377,20 @@
       "lines_valid": 36
     },
     "Drivers/BSP/NETCFG/net_cfg.c": {
-      "func_rate": 0.9375,
-      "funcs_covered": 15,
-      "funcs_valid": 16,
-      "line_rate": 0.9643,
-      "lines_covered": 108,
-      "lines_valid": 112
+      "func_rate": 0.9412,
+      "funcs_covered": 16,
+      "funcs_valid": 17,
+      "line_rate": 0.9685,
+      "lines_covered": 123,
+      "lines_valid": 127
+    },
+    "Drivers/BSP/NETCFG/sntp_cfg.c": {
+      "func_rate": 1.0,
+      "funcs_covered": 5,
+      "funcs_valid": 5,
+      "line_rate": 0.9474,
+      "lines_covered": 18,
+      "lines_valid": 19
     },
     "Drivers/BSP/ScreenLink/sb_link.c": {
       "func_rate": 1.0,
@@ -560,9 +576,10 @@
     },
     "net_cfg": {
       "files": {
-        "Drivers/BSP/NETCFG/net_cfg.c": 112
+        "Drivers/BSP/NETCFG/net_cfg.c": 127,
+        "Drivers/BSP/NETCFG/sntp_cfg.c": 19
       },
-      "lines_total": 112,
+      "lines_total": 146,
       "ok": true
     },
     "net_events": {
@@ -685,6 +702,14 @@
       "lines_total": 114,
       "ok": true
     },
+    "sntp": {
+      "files": {
+        "App/sync/time_sntp.c": 248,
+        "Drivers/BSP/NETCFG/sntp_cfg.c": 19
+      },
+      "lines_total": 267,
+      "ok": true
+    },
     "soe": {
       "files": {
         "App/log/soe_rec.c": 87,
@@ -724,9 +749,9 @@
     },
     "time_sync": {
       "files": {
-        "App/sync/time_sync.c": 100
+        "App/sync/time_sync.c": 101
       },
-      "lines_total": 100,
+      "lines_total": 101,
       "ok": true
     },
     "ui_data": {
@@ -818,6 +843,7 @@
     "App/protocol/iec104/iec104_comm.c",
     "App/protocol/iec104/iec104_link.c",
     "App/protocol/iec104/iec104_pts.c",
+    "App/sync/time_sntp.c",
     "App/sync/time_sync.c",
     "App/task/iec104_serv.c",
     "App/util/boot_stats.c",
@@ -839,6 +865,7 @@
     "Drivers/BSP/NET/net_udp.c",
     "Drivers/BSP/NETCFG/ftp_cfg.c",
     "Drivers/BSP/NETCFG/net_cfg.c",
+    "Drivers/BSP/NETCFG/sntp_cfg.c",
     "Drivers/BSP/ScreenLink/sb_link.c",
     "Drivers/BSP/ScreenLink/sb_proto.c",
     "Drivers/BSP/UI/ui_data.c",
@@ -847,16 +874,16 @@
   ],
   "totals": {
     "files_generated_excluded": 5,
-    "files_tested": 52,
-    "files_untested": 173,
-    "func_rate": 0.9266,
-    "funcs_covered": 619,
-    "funcs_valid": 668,
-    "line_rate": 0.9012,
-    "lines_covered": 8372,
-    "lines_valid": 9290,
-    "modules_ok": 47,
-    "modules_total": 47
+    "files_tested": 54,
+    "files_untested": 177,
+    "func_rate": 0.9292,
+    "funcs_covered": 643,
+    "funcs_valid": 692,
+    "line_rate": 0.9018,
+    "lines_covered": 8633,
+    "lines_valid": 9573,
+    "modules_ok": 48,
+    "modules_total": 48
   },
   "untested_sources": [
     {
@@ -903,6 +930,10 @@
       "code_lines": 264,
       "path": "Drivers/BSP/SD2506/sd2506.c"
     },
+    {
+      "code_lines": 261,
+      "path": "Drivers/BSP/UI/ui_page_sntp.c"
+    },
     {
       "code_lines": 251,
       "path": "Drivers/BSP/UI/ui_page_wave_play.c"
@@ -1219,6 +1250,10 @@
       "code_lines": 26,
       "path": "Drivers/BSP/UI/ui_port.h"
     },
+    {
+      "code_lines": 25,
+      "path": "Drivers/BSP/NETCFG/sntp_cfg.h"
+    },
     {
       "code_lines": 25,
       "path": "Drivers/BSP/bsp_err.h"
@@ -1355,6 +1390,10 @@
       "code_lines": 12,
       "path": "App/app/app_main.h"
     },
+    {
+      "code_lines": 12,
+      "path": "App/sync/time_sntp.h"
+    },
     {
       "code_lines": 12,
       "path": "App/task/iec104_serv.h"
@@ -1427,6 +1466,10 @@
       "code_lines": 11,
       "path": "Drivers/BSP/UI/ui_page_reset.h"
     },
+    {
+      "code_lines": 11,
+      "path": "Drivers/BSP/UI/ui_page_sntp.h"
+    },
     {
       "code_lines": 11,
       "path": "Drivers/BSP/UI/ui_page_soe.h"