Refactor: Rename package from groundcontrol to groundstation

[Brad-Edwards]

Description

Rename the Java package from com.keplerops.groundcontrol to com.keplerops.groundstation across the entire codebase.

Scope

• Rename all Java packages from groundcontrol to groundstation
• Update all import statements referencing the old package
• Update application.properties / application.yml application name
• Update Gradle build configuration if it references the package
• Update any Docker or CI configuration referencing the old name
• Update any test files with old package references

Acceptance Criteria

• All Java source files use com.keplerops.groundstation package
• All imports are updated
• Application name reflects "Ground Station"
• All tests pass with the new package name
• No references to groundcontrol remain in the codebase