fix: 修复国际进港电报详情只读状态下无法滚动

只读态原本通过 EditText.enabled=false 表达，但会一并吞掉触摸滚动手势，
导致文字较多时无法上下查看。改用 focusable/focusableInTouchMode/
cursorVisible/keyListener 组合表达不可编辑，同时保持 enabled=true，
两种状态下文本均可滚动。

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

module_gjj/src/main/java/com/lukouguoji/gjj/activity/IntArrTelegramDetailsActivity.kt

@@ -25,6 +25,17 @@ class IntArrTelegramDetailsActivity : BaseBindingActivity<ActivityIntArrTelegram
     override fun initOnCreate(savedInstanceState: Bundle?) {
         setBackArrow("国际进港电报详情")
         binding.viewModel = viewModel
+
+        val originalKeyListener = binding.etContent.keyListener
+        viewModel.isEditable.observe(this) { editable ->
+            binding.etContent.apply {
+                isFocusable = editable
+                isFocusableInTouchMode = editable
+                isCursorVisible = editable
+                keyListener = if (editable) originalKeyListener else null
+            }
+        }
+
         viewModel.initOnCreated(intent)
     }