feat(屏板): USART1 700 kbaud + 收中断传输层 sb_link（1-2/1-3）

批 1 的 1-2 / 1-3：把屏板（DTU-LCD）发来的 6 B 帧 A 在 USART1 上稳定收下来。

1-2 波特率：.ioc 不保存任何 UART 的波特率（只有
USART1.IPParameters=VirtualMode），GUI 里改也不落盘，所以只能在
Src/usart.c 的 USER CODE BEGIN USART1_Init 2 区覆盖 huart1.Init.BaudRate
后重调一次 HAL_UART_Init（第二次调用时 gState 已非 RESET，HAL 只重算
BRR、不再跑 MspInit，GPIO/DMA/NVIC 不会被重配）。开机日志实测
BRR=0x0078，与理论值 84 MHz/(16x700 kHz)=7.5 逐位相符，误差 0%。

1-3 收中断：新建 Drivers/BSP/ScreenLink/sb_link.c/h——16 B 缓冲 + IDLE
中断断帧、帧 A 校验、错误中断里按 RM0090 清 ORE/NE/FE/PE、周期统计上报。
HAL_UARTEx_RxEventCallback / HAL_UART_ErrorCallback 是全局单例（唯一实现
在 rs485.c），故只在那里各加一行转发，按句柄过滤放在 sb_link 内。

台架实测（PC + USB 转 TTL 顶替屏板，COM6@700000）撞出两个真问题：
- 错误回调里无条件重挂 -> 出现 err=160 / rearm=160 同步增长，看着像每帧
  都重挂失败。真因是 HAL 把 NE/FE/PE 归为非阻塞型（接收照跑、RxState 仍是
  BUSY_RX），此时 ReceiveToIdle_IT 只会返回 HAL_BUSY。改为仅当
  RxState == HAL_UART_STATE_READY（ORE 那类阻塞型）时才重挂。
- 日志字面量里带中文 -> ARMCC #870-D invalid multibyte character
  sequence。字面量一律纯 ASCII，中文只写注释。

验证：主机单测 81/81 PASSED（test/host/sb_link/，其中按 RM0090 的清除语义
把"必须 SR->DR 顺序才清得掉 ORE"钉成断言）；Keil 0 错误 0 警告；台架
rx == 发送帧数、ok == rx、crc=0、len=0、size=6、keys 随按键帧递增；先用
错波特率灌 64 B 垃圾（len=31、bits=0x06）后自动恢复且 rearm=0。
新增 test/host/screenlink_bench.py 作为可复跑的屏板激励（--key / --glitch-baud）。

scripts/check_registration.py

@@ -136,6 +136,7 @@ SIM_EXEMPT = [
     ("Drivers/BSP/RS485/rs485.c", "MCU RS-485 驱动"),
     ("Drivers/BSP/SD2506/sd2506.c", "MCU RTC 驱动"),
     ("Drivers/BSP/ScreenLink/sb_proto.c", "屏板链路协议层纯逻辑（帧 A 解析 / 帧 B 组帧 / CRC-16），消费者 = MCU 侧 USART1 收发起发（批 1/2），模拟器无消费路径；主机侧纯逻辑单测覆盖于 test/host/sb_proto"),
+    ("Drivers/BSP/ScreenLink/sb_link.c", "屏板链路传输层（USART1 IDLE 中断收 + ORE 清除 + 统计），依赖 HAL 句柄与中断上下文，MCU 专属；主机侧单测以桩覆盖于 test/host/sb_link"),
     ("Drivers/BSP/TPAFE5160/tpafe5160.c", "MCU 计量芯片驱动"),
     ("Drivers/BSP/UI/ui_port.c", "MCU UI 端口层（显示/触摸硬件），模拟器另有 sim/sim_port.c"),
 ]

scripts/ram_baseline.tsv

@@ -11,4 +11,4 @@ date	code	ro	rw	zi	er_irom1	er_pct	iram1	iram1_pct	ccm	ccm_pct	top_rwzi
 2026-10-26	231712	25560	1520	136216	257272	24.5	80312	61.3	57376	87.9	heap_4.o=57376;lv_mem_core_builtin.o=16384;lftpd.o=7884;ui_net_sink.o=6770;ui_port.o=6420;nand_ftl.o=6216;ch395f.o=4162;console_log.o=4132;sys_log_mcu.o=4003;default_task.o=2736
 2026-10-27	235372	26392	1572	136924	261764	25.0	81072	61.9	57376	87.9	heap_4.o=57376;lv_mem_core_builtin.o=16384;lftpd.o=7884;ui_net_sink.o=6770;ui_port.o=6420;nand_ftl.o=6216;ch395f.o=4162;console_log.o=4132;sys_log_mcu.o=4055;default_task.o=2736
 2026-10-28	236456	28124	1876	137084	264580	25.2	81536	62.2	57376	87.9	heap_4.o=57376;lv_mem_core_builtin.o=16384;lftpd.o=7884;ui_net_sink.o=6770;ui_port.o=6420;nand_ftl.o=6216;ch395f.o=4162;console_log.o=4132;sys_log_mcu.o=4055;default_task.o=2736
-2026-10-29	236460	28124	1876	137084	264584	25.2	81536	62.2	57376	87.9	heap_4.o=57376;lv_mem_core_builtin.o=16384;lftpd.o=7884;ui_net_sink.o=6770;ui_port.o=6420;nand_ftl.o=6216;ch395f.o=4162;console_log.o=4132;sys_log_mcu.o=4055;default_task.o=2736
+2026-10-29	237464	28896	1900	137140	266360	25.4	81616	62.3	57376	87.9	heap_4.o=57376;lv_mem_core_builtin.o=16384;lftpd.o=7884;ui_net_sink.o=6770;ui_port.o=6420;nand_ftl.o=6216;ch395f.o=4162;console_log.o=4132;sys_log_mcu.o=4055;default_task.o=2736

scripts/size_attestation.json

@@ -1,25 +1,25 @@
 {
-  "built_at": "2026-10-29T19:17:06+08:00",
-  "fingerprint": "df1c01abda2bd6778c11976f346e1a9024386ae2809f94c720da9f95ef59becc",
-  "fingerprint_files": 1454,
+  "built_at": "2026-10-29T20:05:10+08:00",
+  "fingerprint": "aff51072f981be06701568ea469dd4baa0278299ac530446feb299ac0cba8abd",
+  "fingerprint_files": 1456,
   "fingerprint_source": "git-index",
   "gated_regions": [
     "RW_IRAM1",
     "RW_CCM"
   ],
-  "git_head": "71b6a5fa14db85ed9c95bba5b3b6106d1f20d223",
+  "git_head": "2c69a6ca076d201a2f412318bdfaa91f20632c48",
   "map": "MDK-ARM/STM32F407-Demo/STM32F407-Demo.map",
-  "map_mtime": 1793272621,
+  "map_mtime": 1793275502,
   "pct": {
-    "ER_IROM1": 25.23,
+    "ER_IROM1": 25.4,
     "RW_CCM": 87.89,
-    "RW_IRAM1": 62.21,
+    "RW_IRAM1": 62.27,
     "UNINIT_CCM": 18.75
   },
   "regions": {
     "ER_IROM1": {
       "max": 1048576,
-      "size": 264584
+      "size": 266360
     },
     "RW_CCM": {
       "max": 65280,
@@ -27,7 +27,7 @@
     },
     "RW_IRAM1": {
       "max": 131072,
-      "size": 81536
+      "size": 81616
     },
     "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": 236460,
-    "ro_data": 28124,
-    "rw_data": 1876,
-    "zi_data": 137084
+    "code": 237464,
+    "ro_data": 28896,
+    "rw_data": 1900,
+    "zi_data": 137140
   },
   "threshold_pct": 92.0,
   "worktree_dirt_at_stamp": 0,

scripts/test_coverage_baseline.json

@@ -344,6 +344,14 @@
       "lines_covered": 108,
       "lines_valid": 112
     },
+    "Drivers/BSP/ScreenLink/sb_link.c": {
+      "func_rate": 1.0,
+      "funcs_covered": 7,
+      "funcs_valid": 7,
+      "line_rate": 0.9896,
+      "lines_covered": 95,
+      "lines_valid": 96
+    },
     "Drivers/BSP/ScreenLink/sb_proto.c": {
       "func_rate": 1.0,
       "funcs_covered": 6,
@@ -615,6 +623,14 @@
       "lines_total": 961,
       "ok": true
     },
+    "sb_link": {
+      "files": {
+        "Drivers/BSP/ScreenLink/sb_link.c": 96,
+        "Drivers/BSP/ScreenLink/sb_proto.c": 74
+      },
+      "lines_total": 170,
+      "ok": true
+    },
     "sb_proto": {
       "files": {
         "Drivers/BSP/ScreenLink/sb_proto.c": 74
@@ -756,6 +772,7 @@
     "Drivers/BSP/NET/net_socket.c",
     "Drivers/BSP/NETCFG/ftp_cfg.c",
     "Drivers/BSP/NETCFG/net_cfg.c",
+    "Drivers/BSP/ScreenLink/sb_link.c",
     "Drivers/BSP/ScreenLink/sb_proto.c",
     "Drivers/BSP/UI/ui_data.c",
     "Drivers/BSP/UI/ui_net_sink.c",
@@ -763,16 +780,16 @@
   ],
   "totals": {
     "files_generated_excluded": 5,
-    "files_tested": 47,
-    "files_untested": 164,
-    "func_rate": 0.9324,
-    "funcs_covered": 538,
-    "funcs_valid": 577,
-    "line_rate": 0.8993,
-    "lines_covered": 7132,
-    "lines_valid": 7931,
-    "modules_ok": 42,
-    "modules_total": 42
+    "files_tested": 48,
+    "files_untested": 165,
+    "func_rate": 0.9332,
+    "funcs_covered": 545,
+    "funcs_valid": 584,
+    "line_rate": 0.9003,
+    "lines_covered": 7227,
+    "lines_valid": 8027,
+    "modules_ok": 43,
+    "modules_total": 43
   },
   "untested_sources": [
     {
@@ -821,11 +838,11 @@
     },
     {
       "code_lines": 215,
-      "path": "Drivers/BSP/UI/ui_w_setlist.c"
+      "path": "App/task/ui_task.c"
     },
     {
-      "code_lines": 214,
-      "path": "App/task/ui_task.c"
+      "code_lines": 215,
+      "path": "Drivers/BSP/UI/ui_w_setlist.c"
     },
     {
       "code_lines": 206,
@@ -864,7 +881,7 @@
       "path": "Drivers/BSP/UI/ui_page_device_info.c"
     },
     {
-      "code_lines": 135,
+      "code_lines": 142,
       "path": "App/app/app_main.c"
     },
     {
@@ -916,7 +933,7 @@
       "path": "Drivers/BSP/NET/net_socket.h"
     },
     {
-      "code_lines": 79,
+      "code_lines": 81,
       "path": "Drivers/BSP/RS485/rs485.c"
     },
     {
@@ -1043,6 +1060,10 @@
       "code_lines": 33,
       "path": "Drivers/BSP/NET/net_select.h"
     },
+    {
+      "code_lines": 33,
+      "path": "Drivers/BSP/ScreenLink/sb_link.h"
+    },
     {
       "code_lines": 33,
       "path": "Drivers/BSP/UI/ui_page_action.h"