fix(m198): JAVAGUARD——首屏自动扫 / 子进程回收 / 参数长度三条守卫 + 设置页正文结构断言

- 首屏自动扫：删掉 `cfg!(test)` 分叉，生产入口在测试里真跑；新增
  `the_first_hydrate_starts_a_real_scan_by_itself`（删掉那一行、或把实参翻成 `true`
  都红）。顺手删掉恒为假的 `seeded && !live`：截图种子档在上方就 return 了，编译器也
  报 "assigned but never used"。
- proc：`kill()` + `wait()` 收进 `terminate()`（三个分支共用）；用例先用同一条命令
  真跑一次证明子进程起得来（`spawn().ok()?` 的空跑假绿），并新增 Linux/Android 的
  僵尸回收用例（只 kill 不 wait ⇒ `/proc/<pid>` 留成僵尸）。
- java.extra_args：`MAX_JVM_ARGS = 1024` 镜像 schema，`Refusal::JvmTooLong` + 中英
  文案 + JVM 输入框变红；App 级用例断言回执是具名的「太长」而不是通用的「写不进去」。
- 设置页正文：判据①从「数 `stack = stack.push(` 的出现次数」升级成按角色断言
  （唯一来源 section_columns、`push(` 恰一次且实参是循环变量、尾表达式、禁
  extend/chain/once/concat/append），单行折叠变异体现在会红。

crates/i18n/src/catalog/golden/tail.rs

@@ -132,6 +132,7 @@ pub(super) const ROWS: &[(&str, &str, &str)] = &[
     ("SettingsJavaReasonMemoryNotNumber", "the memory must be a whole number of MB", "内存必须是整数 MB"),
     ("SettingsJavaReasonMemoryRange", "the memory is outside the allowed range", "内存超出允许范围"),
     ("SettingsJavaReasonJvmQuotes", "the JVM arguments have an unclosed quote", "JVM 参数里有没配对的引号"),
+    ("SettingsJavaReasonJvmTooLong", "the JVM arguments are longer than the settings file allows (1024 characters)", "JVM 参数超过配置文件允许的长度（1024 字符）"),
     ("SettingsJavaReasonAddEmpty", "the path is empty", "路径是空的"),
     ("SettingsJavaReasonAddMissing", "nothing exists at that path", "那个路径上什么都没有"),
     ("SettingsJavaReasonAddNotJava", "there is no java executable at that path", "那个路径里没有 java 可执行文件"),

crates/i18n/src/catalog/settings/java.rs

@@ -125,6 +125,10 @@ macro_rules! settings_java_entries {
                 "the JVM arguments have an unclosed quote",
                 "JVM 参数里有没配对的引号"
             ),
+            SettingsJavaReasonJvmTooLong => (
+                "the JVM arguments are longer than the settings file allows (1024 characters)",
+                "JVM 参数超过配置文件允许的长度（1024 字符）"
+            ),
             SettingsJavaReasonAddEmpty => ("the path is empty", "路径是空的"),
             SettingsJavaReasonAddMissing => ("nothing exists at that path", "那个路径上什么都没有"),
             SettingsJavaReasonAddNotJava => (