Build offline OpenPrestige release bundles

Rename the injector and package it with an embedded payload for Windows, Linux, and macOS x64/ARM64. Add a core-only ImGui native build, multi-platform CI and release packaging, and shared per-user storage with legacy config migration.

build-injector.ps1

@@ -1,6 +1,4 @@
-# Builds the Prestige payload jar (remapped for the production Fabric runtime), then the Rust injector and loader DLL,
-# and collects PrestigeInjector.exe + prestige_native.dll in dist\.
-# native tools write progress/notes to stderr; failures are detected through $LASTEXITCODE instead
+# Build OpenPrestige and collect the host binaries in dist/.
 $ErrorActionPreference = 'Continue'
 Set-Location $PSScriptRoot
 if (Test-Path 'C:\Program Files\Eclipse Adoptium\jdk-21.0.12.101-hotspot') { $env:JAVA_HOME = 'C:\Program Files\Eclipse Adoptium\jdk-21.0.12.101-hotspot' }
@@ -9,6 +7,6 @@ if ($LASTEXITCODE -ne 0) { throw 'gradle remapJar failed' }
 cargo build --release --manifest-path injector\Cargo.toml
 if ($LASTEXITCODE -ne 0) { throw 'cargo build failed' }
 New-Item -ItemType Directory -Force dist | Out-Null
-Copy-Item injector\target\release\PrestigeInjector.exe, injector\target\release\prestige_native.dll dist\ -Force
+Copy-Item injector\target\release\OpenPrestigeInjector.exe, injector\target\release\prestige_native.dll dist\ -Force
 Get-ChildItem build\libs\prestige-*.jar | Where-Object { $_.Name -notmatch '-(dev|sources)\.jar$' } | Copy-Item -Destination dist\ -Force
-Write-Host 'Done: dist\PrestigeInjector.exe + dist\prestige_native.dll + dist\prestige-*.jar (Fabric mod)'
+Write-Host 'Done: dist\OpenPrestigeInjector.exe + native library + Fabric mod JAR'