Add JVM --add-opens flags for Java 17 strong encapsulation workarounds

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Summary

Adds --add-opens JVM arguments to the test and bootRun tasks in build.gradle to handle Java 17's strong encapsulation of JDK internals. Three modules are opened to ALL-UNNAMED:

• java.base/java.lang
• java.base/java.lang.reflect
• java.base/java.util

These are proactively added for the Spring Boot 2.7.x + MyBatis + Jackson + jjwt stack, which commonly uses reflective access to these modules. During testing, compilation and all tests passed without these flags, but they are known to be needed at runtime for this tech stack to prevent InaccessibleObjectException.

Note: The spotlessJava task has a separate IllegalAccessError (google-java-format accessing jdk.compiler internals) that is not addressed by this PR, as it requires Spotless plugin configuration changes rather than test/bootRun JVM flags.

Review & Testing Checklist for Human

• Verify these three --add-opens flags are sufficient for runtime — consider whether additional modules (e.g., java.base/java.io, java.base/sun.security.ssl) may be needed for jjwt or Spring Security
• Run ./gradlew clean build -x spotlessCheck and ./gradlew bootRun locally with Java 17 to confirm no new illegal access warnings appear at runtime
• Confirm no existing bootRun configuration elsewhere in the build that could conflict with the new block

Notes

• The whitespace change on useJUnitPlatform() (tab → spaces) is intentional cleanup alongside the functional change
• The spotless/google-java-format IllegalAccessError on Java 17 is a known issue that needs to be addressed separately (typically by upgrading the Spotless plugin or adding --add-opens to the Spotless task's own JVM args)

Link to Devin session: https://app.devin.ai/sessions/f32d7e86677744e381004de72ac6d100
Requested by: @shayanshafii

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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