v2.4.1: Replace raw wrapper script editor with structured config UI

Replace the raw textarea script editor with a structured form for Java
wrapper configuration. Users now manage two lists (JVM flags to strip,
args to inject with server/always condition) instead of editing bash/batch
scripts directly. Scripts are generated at launch time from the structured
config. Includes collapsible script preview for power users.

backend/launcher.js

@@ -45,7 +45,13 @@ const {
   saveVersionClient,
   loadVersionClient,
   saveVersionBranch,
-  loadVersionBranch
+  loadVersionBranch,
+  // Java Wrapper Config
+  getDefaultWrapperConfig,
+  loadWrapperConfig,
+  saveWrapperConfig,
+  resetWrapperConfig,
+  generateWrapperScript
 } = require('./core/config');
 
 const { getResolvedAppDir, getModsPath } = require('./core/paths');
@@ -197,6 +203,13 @@ module.exports = {
   proposeGameUpdate,
   handleFirstLaunchCheck,
 
+  // Java Wrapper Config functions
+  getDefaultWrapperConfig,
+  loadWrapperConfig,
+  saveWrapperConfig,
+  resetWrapperConfig,
+  generateWrapperScript,
+
   // Path functions
   getResolvedAppDir
 };