Migrate project to Java 25

[Copilot]

Migrates the project from Java 11 to Java 25 using the org.openrewrite.java.migrate.UpgradeToJava25 OpenRewrite recipe.

Build configuration

• maven.compiler.release: 11 → 25 (removed redundant source/target properties)
• maven-compiler-plugin: 3.11.0 → 3.15.0
• maven-surefire-plugin / maven-failsafe-plugin: 3.2.2 → 3.5.5
• Added --add-opens JVM args required for Java 25 module encapsulation

CI

• JDK version: 11 → 25 (Temurin)

Source — Java 25 language features applied

Feature	JEP	Since
Instance void main() entry point	JEP 477	Java 23
Unnamed catch variable _	JEP 456	Java 22
Pattern matching instanceof	JEP 394	Java 16
Switch expressions	JEP 361	Java 14

// Before
} catch (IllegalArgumentException e) {
    throw new WebApplicationException("Invalid house: " + house, ...);
}
String description;
switch (house) {
    case GRYFFINDOR: description = "..."; break;
    ...
}

// After
} catch (IllegalArgumentException _) {
    throw new WebApplicationException("Invalid house: " + house, ...);
}
return switch (house) {
    case GRYFFINDOR -> "...";
    ...
};

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This change was produced with Moderne CLI and Moderne Agent Tools (MCP). MCP was unavailable for part of this work; Moderne CLI fallback was used.