feat(java): Separate the jdtls JDK and add Settings for New Projects (#21)

- Languages & Frameworks › Java › Language Server › JDK (languages.java.jdtlsJdk) runs jdtls on its own JDK, like IDEA's JDK for importer; the project keeps compiling and running with the Project JDK.
- Toolchain pages get the Global / This project switch (default This project); Global shows and edits the global layer.
- File › New Projects Setup › Settings for New Projects… edits only the global layer, which new projects inherit.
- Configuration errors (launch_error) show as "Not started" instead of "Crashed".

Fixes #18
Fixes #19

Claude-Session: https://claude.ai/code/session_01SaPPsVPuk6ZTNsoUCNCbMv

src/platform/languageSettings.ts

@@ -13,6 +13,7 @@ export interface LanguagesValid {
   typescript: { version: string };
   java: {
     jdk: string;
+    jdtlsJdk: string;
     jdtlsVmArgs: string;
     maven: { home: string; userSettings: string; localRepository: string };
   };
@@ -34,7 +35,7 @@ export const DEFAULT_LANGUAGES: LanguagesValid = {
   rust: { toolchain: "", stdlib: "", checkOnSave: true, checkCommand: "check", rustfmtArgs: "" },
   go: { goroot: "", gopath: "" },
   typescript: { version: "bundled" },
-  java: { jdk: "", jdtlsVmArgs: "", maven: { home: "", userSettings: "", localRepository: "" } },
+  java: { jdk: "", jdtlsJdk: "", jdtlsVmArgs: "", maven: { home: "", userSettings: "", localRepository: "" } },
 };
 
 export const DEFAULT_PROJECT_STRUCTURE: ProjectStructureValid = {
@@ -101,6 +102,7 @@ export function validateLanguages(raw: unknown): LanguagesValid {
     typescript: { version: text(ts.version, d.typescript.version) || d.typescript.version },
     java: {
       jdk: text(java.jdk, d.java.jdk),
+      jdtlsJdk: text(java.jdtlsJdk, d.java.jdtlsJdk),
       jdtlsVmArgs: text(java.jdtlsVmArgs, d.java.jdtlsVmArgs),
       maven: {
         home: text(maven.home, d.java.maven.home),

src/platform/locales/en.json

@@ -141,6 +141,8 @@
   "menu.editor.unsplit": "Unsplit",
   "menu.file": "File",
   "menu.fileProperties": "File Properties",
+  "menu.newProjectsSetup": "New Projects Setup",
+  "menu.file.newProjectsSettings": "Settings for New Projects…",
   "menu.file.toggleReadOnly": "Make File Read-only / Writable",
   "menu.file.closeProject": "Close Project",
   "menu.file.new": "New…",

src/platform/locales/text/zh.json

@@ -1330,6 +1330,8 @@
   "Passed as -s (mirrors, servers, proxies).": "以 -s 传入（镜像、服务器、代理）。",
   "Passed to rustfmt when reformatting, e.g. --edition 2024": "重新格式化时传递给 rustfmt，例如 --edition 2024",
   "Passed to the JVM running jdtls (java.jdt.ls.vmargs), e.g. -Xmx2g. A Lombok agent is added automatically when the project uses Lombok.": "传递给运行 jdtls 的 JVM (java.jdt.ls.vmargs)，例如 -Xmx2g。项目使用 Lombok 时会自动添加 Lombok 代理。",
+  "Runs jdtls only, like IDEA's JDK for importer; the project keeps compiling and running with the Project JDK. jdtls needs JDK 21 or newer (recent releases 25). The jdtls executable itself is set in Language Servers.": "仅用于运行 jdtls（类似 IDEA 的「导入器 JDK」）；项目仍使用项目 JDK 编译和运行。jdtls 需要 JDK 21 或更高版本（较新版本需要 25）。jdtls 可执行文件本身在「语言服务器」中设置。",
+  "Language server JDK": "语言服务器 JDK",
   "Password": "密码",
   "Password:": "密码：",
   "Paste": "粘贴",
@@ -1807,6 +1809,9 @@
   "Settings pages": "设置页面",
   "Settings scope": "设置范围",
   "Settings…": "设置…",
+  "Settings for New Projects": "新项目的设置",
+  "Settings for New Projects…": "新项目的设置…",
+  "Saved to the global settings: used by new projects and by projects without their own value.": "保存到全局设置：新项目以及未单独设置的项目都会使用。",
   "Shelf": "搁置",
   "Shell integration": "Shell 集成",
   "Shell path": "Shell 路径",
@@ -2310,6 +2315,7 @@
   "or click a line number to set a breakpoint.": "或点击行号设置断点。",
   "or pick one in the toolbar.": "或在工具栏中选择一个。",
   "per module, the JDK of its Java version": "按模块使用与其 Java 版本匹配的 JDK",
+  "the project JDK if new enough, else the first installed JDK that is": "项目 JDK 版本足够时使用它，否则使用第一个版本足够的已安装 JDK",
   "pip output": "pip 输出",
   "places the caret. A line with": "放置光标。包含",
   "println! with Debug": "使用 Debug 的 println!",

src/platform/locales/zh.json

@@ -141,6 +141,8 @@
   "menu.editor.unsplit": "取消拆分",
   "menu.file": "文件",
   "menu.fileProperties": "文件属性",
+  "menu.newProjectsSetup": "新项目设置",
+  "menu.file.newProjectsSettings": "新项目的设置…",
   "menu.file.toggleReadOnly": "将文件设为只读/可写",
   "menu.file.closeProject": "关闭项目",
   "menu.file.new": "新建…",