build: Prioritize Temurin 25 for default toolchain and keep Gluon for native-only path

Problem:
- The pinned Gluon Graal toolchain (github:gluonhq/graal@gluon-23+25.1-dev-2409082136) is not updated frequently.
- Using it as the default Java for general development/build paths can increase long-term risk exposure (e.g., delayed security updates) for non-native workflows.

Actions:
- Reordered [.mise.toml] tool priority to make 'java = temurin-25' the default Java toolchain.
- Kept the Gluon Graal pin in place for native-image scenarios that explicitly require it.
- Preserved the existing build contract where build.gradle routes only native build flow to Gluon, while regular jar/jpackage and day-to-day usage stay on Temurin 25.

Result:
- General usage and standard builds now resolve to Temurin 25 by default.
- Native build path continues to use Gluon Graal explicitly, without changing jar/jpackage behavior.

Author: luckyabsoluter

.mise.toml

@@ -3,5 +3,5 @@ TEMP = "C:\\Temp"
 TMP = "C:\\Temp"
 
 [tools]
+java = "temurin-25"
 "github:gluonhq/graal" = "gluon-23+25.1-dev-2409082136"
-java = "graalvm-community-25.0.2"