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/presenter/src/mock_data.rs

@@ -4,8 +4,8 @@
 
 use crate::dto::{
     AncientKind, ChatMessage, ChatRole, Diagnosis, DiagnosisReport, InstanceRuntime,
-    InstanceSummary, LoaderInfo, LoaderKind, LogLevel, LogLine, LogOutcome, LogSession, SessionId,
-    ToolCallView, VersionCategory, VersionKind, VersionSummary,
+    InstanceSummary, LaunchArgsView, LoaderInfo, LoaderKind, LogLevel, LogLine, LogOutcome,
+    LogSession, SessionId, ToolCallView, VersionCategory, VersionKind, VersionSummary,
 };
 
 /// P0 演示实例：覆盖空闲 / 失败两种磁贴状态（运行中由启动脚本产生）。
@@ -25,6 +25,7 @@ pub fn mock_instances() -> Vec<InstanceSummary> {
             isolation: "isolated".to_string(),
             version_id: "1.20.4".to_string(),
             version_present: true,
+            launch: mock_launch(),
         },
         InstanceSummary {
             id: "vanilla-latest".to_string(),
@@ -40,6 +41,7 @@ pub fn mock_instances() -> Vec<InstanceSummary> {
             isolation: "isolated".to_string(),
             version_id: "1.21.9".to_string(),
             version_present: true,
+            launch: mock_launch(),
         },
         InstanceSummary {
             id: "ancient-1.7.10".to_string(),
@@ -55,6 +57,7 @@ pub fn mock_instances() -> Vec<InstanceSummary> {
             isolation: "shared".to_string(),
             version_id: "1.7.10".to_string(),
             version_present: false,
+            launch: mock_launch(),
         },
         InstanceSummary {
             id: "modded-dev".to_string(),
@@ -72,6 +75,7 @@ pub fn mock_instances() -> Vec<InstanceSummary> {
             isolation: "isolated".to_string(),
             version_id: "1.21.1-neoforge-21.1.72".to_string(),
             version_present: true,
+            launch: mock_launch(),
         },
     ]
 }
@@ -236,3 +240,26 @@ mod tests {
         assert!(mock_versions_for(VersionCategory::Mod).is_empty());
     }
 }
+
+/// 演示用的启动参数视图（M157）：一条真实形状的实例（有 JVM 参数、Vulkan、门槛放行）。
+fn mock_launch() -> LaunchArgsView {
+    LaunchArgsView {
+        instance_id: "survival".to_string(),
+        jvm_args: "-XX:+UseG1GC".to_string(),
+        game_args: String::new(),
+        memory_mb: Some(4096),
+        memory_effective_mb: 4096,
+        java_path: String::new(),
+        java_effective: "C:/Java/temurin-21/bin/java.exe".to_string(),
+        graphics_backend: "vulkan".to_string(),
+        graphics_backend_effective: "vulkan".to_string(),
+        graphics_backend_allowed: true,
+        mc_version: "26.2-snapshot-2".to_string(),
+        graphics_backend_min_version: "26.2-snapshot-2".to_string(),
+        graphics_backend_options: vec![
+            "default".to_string(),
+            "opengl".to_string(),
+            "vulkan".to_string(),
+        ],
+    }
+}