feat(launch): M157 实例级启动参数（五项回落 + graphicsBackend 三态）

core: 新增 game/launch_overrides（LaunchOverrides 五项 All-Option + 三级回落 + 文本补丁校验）与 launch/overrides（拼装落位：全局 java.extra_args 进 user.jvm、实例 jvmArgs 进 override_jvm、gameArgs 进 user.game、memory 进 -Xmx、backend 进 --graphicsBackend 并复用既有版本门槛告警）；实例 schema 登记 launch.* 五键。

presenter: dto/LaunchArgsView+LaunchArgsPatch，主机侧读/写与门槛判定（backend_allowed），AppCommand::SetInstanceLaunchArgs。

cli: 新命令 instances launch-args（读/写/--clear），launch 装配链消费回落值。

app-iced: 实例详情页「启动参数」区（JVM/游戏参数、内存、Java、三态后端 chips + 灰化提示 + 保存/恢复），表单状态归 App、i18n 中英文案同步。

crates/app-iced/src/pages/mod.rs

@@ -126,10 +126,12 @@ pub(crate) mod settings;
 #[cfg(test)]
 mod tests;
 pub use download::{cancelled_toast, Category, Download, InstallDraft, Loader};
+pub(crate) use instances::demo_form as demo_launch_form;
+pub use instances::{InstanceMessage, LaunchForm};
 pub use layout::{FrameMetrics, PageLayout, PaneKit, WidthClass};
 pub use logs::{Confidence, Finding, Level, Line, Logs, Outcome};
 pub use message::{Action, Message};
-pub use model::{Detail, Instances, Meta, Model, Row};
+pub use model::{Detail, Instances, LaunchFacts, Meta, Model, Row};
 pub use screen::Screen;
 pub use settings::Language;
 
@@ -150,7 +152,11 @@ use frame::filled;
 ///
 /// 视图模型由**调用方持有**（`App` 在状态变化时重建一次 `Model`），这里只借用：
 /// `view(&self)` 不能返回一棵借用局部变量的树。
-pub fn page<'a>(ui: &'a Ui, model: &'a Model) -> Element<'a, Message> {
+pub fn page<'a>(
+    ui: &'a Ui,
+    model: &'a Model,
+    form: &'a instances::LaunchForm,
+) -> Element<'a, Message> {
     render(
         ui,
         model,
@@ -159,6 +165,7 @@ pub fn page<'a>(ui: &'a Ui, model: &'a Model) -> Element<'a, Message> {
             groups: settings::demo_groups(),
         },
         Language::default(),
+        form,
     )
 }
 
@@ -174,6 +181,7 @@ pub fn page_with_appearance<'a>(
     ui: &'a Ui,
     model: &'a Model,
     appearance: &'a appearance::State,
+    form: &'a instances::LaunchForm,
 ) -> Element<'a, Message> {
     render(
         ui,
@@ -183,6 +191,7 @@ pub fn page_with_appearance<'a>(
             groups: settings::demo_groups(),
         },
         Language::default(),
+        form,
     )
 }
 
@@ -199,8 +208,9 @@ pub fn page_with_settings<'a>(
     model: &'a Model,
     states: settings::States<'a>,
     language: Language,
+    launch_form: &'a instances::LaunchForm,
 ) -> Element<'a, Message> {
-    render(ui, model, states, language)
+    render(ui, model, states, language, launch_form)
 }
 
 fn render<'a>(
@@ -208,11 +218,12 @@ fn render<'a>(
     model: &'a Model,
     states: settings::States<'a>,
     language: Language,
+    launch_form: &'a instances::LaunchForm,
 ) -> Element<'a, Message> {
     let metrics = layout::frame_metrics(model.screen.kit(), model.window_width);
 
     match model.screen {
-        Screen::Instances => instances::view(ui, metrics, model),
+        Screen::Instances => instances::view(ui, metrics, model, launch_form),
         // M106：下载页此前写死成 `Lang::En`，现在跟 `model.lang`（页面文案跟着界面语言走）。
         Screen::Download => download::view(ui, metrics, &model.download, model.lang),
         // M109：内容库页同样跟 `model.lang`
@@ -227,8 +238,12 @@ fn render<'a>(
 /// 产品路径**不走这里**（它走 [`page`] + `shell::view_with_content`，用真标题栏）。这个入口留给
 /// `pages_demo` example 与单测：它们要一张「只有页面、不接 app 消息」的独立图，而 `shell` 的
 /// 回调类型是 `crate::app::Message`，套不进 `pages::Message` 的树里。
-pub fn app<'a>(ui: &'a Ui, model: &'a Model) -> Element<'a, Message> {
-    app_with_appearance(ui, model, None)
+pub fn app<'a>(
+    ui: &'a Ui,
+    model: &'a Model,
+    form: &'a instances::LaunchForm,
+) -> Element<'a, Message> {
+    app_with_appearance(ui, model, None, form)
 }
 
 /// 同 [`app`]，但可以带上**外观运行期状态**。
@@ -241,6 +256,7 @@ pub fn app_with_appearance<'a>(
     ui: &'a Ui,
     model: &'a Model,
     appearance: Option<&'a appearance::State>,
+    form: &'a instances::LaunchForm,
 ) -> Element<'a, Message> {
     // harness 路径没有真组状态：用演示状态（[`settings::demo_groups`]），外观状态照传。
     let body = render(
@@ -251,6 +267,7 @@ pub fn app_with_appearance<'a>(
             groups: settings::demo_groups(),
         },
         Language::default(),
+        form,
     );
 
     let shell = row![nav::rail(ui, model.active), body]