移除 OpenCode 配置与命令，技能与串口单一配置源迁移至 .dsh/skills 与 .serialtest，同步更新全部文档引用

.dsh/skills/serial-boot-test/config.example.json

@@ -0,0 +1,29 @@
+{
+  "portName": "COM6",
+  "baudRate": 115200,
+
+  "flash_cmd": "MDK-ARM\\reset.bat flash",
+  "flash_timeout": 180,
+  "hex": "MDK-ARM\\STM32F407-Demo\\STM32F407-Demo.hex",
+  "fw_marker": "fw build: ",
+  "readback_cmd": "MDK-ARM\\reset.bat cmp {hex}",
+  "readback_ok": "no difference found",
+
+  "required": "App init OK;Network Init;net init: OK",
+  "forbidden": "FAIL;ERROR;HardFault;[ERR]",
+  "boot_marker": "reset cause:",
+  "max_boot_count": 1,
+  "done_marker": "net init: OK",
+  "max_boot_ms": 0,
+  "require_order": "",
+  "expect_reset_cause": "",
+
+  "settle_ms": 8000,
+  "max_wait_ms": 30000,
+  "first_wait_ms": 12000,
+
+  "require_selftest_pass": false,
+  "device_ip": "",
+
+  "httpPort": 18765
+}