fix: 流程对齐 iOS 严格 1:1（disconnect 不清 sn/firmwareUpgrade）

发现并修正以下 1:1 复刻偏离：

1. SDK：disconnect 行为
   - iOS：被动断开 / 主动 disconnect 都 **不清** sn / firmwareUpgrade
     · sn 仅在 unbind 成功 / fetchLatestFirmware 软绑失败回滚时清空
     · firmwareUpgrade 仅在 fetchLatestFirmware 成功时覆盖
   - 之前 Android 在两个 disconnect 入口都清，与 iOS 不一致；现已修正

2. Demo：otaFetchUserId / otaFetchSn 进入页面时的初始化
   - iOS：onAppear 时同步默认 userId / 当前 sdk.sn 到字段
   - Android：之前 bind 后才填，进入页面默认空；现已与 iOS 对齐

3. Demo：ConfigField 禁用自动大写 / 自动纠错
   - iOS 用 .autocapitalization(.none).disableAutocorrection(true)
   - Android 加 KeyboardOptions(autoCorrect=false, capitalization=None)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

demo/src/main/kotlin/com/duooomi/ble/demo/DemoScreen.kt

@@ -84,14 +84,20 @@ fun DemoScreen(
     var otaFetchVersion by remember(sdk) { mutableStateOf("") }
     var otaFetchUserId by remember(sdk) { mutableStateOf("") }
 
-    // bind 完成 → 回填 OTA 入参
-    LaunchedEffect(isActivated, sn) {
-        if (isActivated && sn.isNotEmpty()) {
+    // 进入页面初次填充（对齐 iOS WrapperTestView onAppear）
+    LaunchedEffect(sdk) {
+        if (otaFetchSn.isEmpty()) otaFetchSn = sn
+        if (otaFetchVersion.isEmpty()) otaFetchVersion = version
+        if (otaFetchUserId.isEmpty()) otaFetchUserId = userId
+    }
+    // bind 完成 → 自动回填 sn / currentVersion（对齐 iOS onChange isActivated）
+    LaunchedEffect(isActivated) {
+        if (isActivated) {
             otaFetchSn = sn
-            if (version.isNotEmpty()) otaFetchVersion = version
-            if (otaFetchUserId.isEmpty()) otaFetchUserId = userId
+            otaFetchVersion = version
         }
     }
+    // getVersion 单独触发时也同步过来
     LaunchedEffect(version) {
         if (version.isNotEmpty()) otaFetchVersion = version
     }
@@ -605,7 +611,11 @@ private fun ConfigField(label: String, value: String, onChange: (String) -> Unit
             onValueChange = onChange,
             modifier = Modifier.weight(1f),
             singleLine = true,
-            textStyle = androidx.compose.ui.text.TextStyle(fontSize = 12.sp)
+            textStyle = androidx.compose.ui.text.TextStyle(fontSize = 12.sp),
+            keyboardOptions = androidx.compose.foundation.text.KeyboardOptions(
+                autoCorrect = false,
+                capitalization = androidx.compose.ui.text.input.KeyboardCapitalization.None
+            )
         )
     }
 }