feat: add support for surf-core api integration

[TheBjoRedCraft]

No description provided.

[Copilot]

Pull request overview

This PR adds support for core modules in the Gradle plugin configuration, mirroring the existing cloud module pattern. The implementation allows projects to declare dependencies on platform-specific core modules (Common, Paper, Velocity) through the Gradle plugin extension.

Key changes:

• Introduced SurfCoreModules enum to define available core module types
• Extended plugin extensions with coreModule property and helper methods (withCoreCommon, withCorePaper, withCoreVelocity)
• Updated plugin dependency registration to include core modules in Paper and Velocity plugin descriptors

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
SurfCoreModules.kt	New enum defining the three core module types (COMMON, PAPER, VELOCITY) with their Maven artifact names
CommonSurfExtension.kt	Added coreModule property to hold the selected core module; minor formatting improvement to publishingUrl property
CoreSurfExtension.kt	Added three convenience methods (withCoreCommon, withCorePaper, withCoreVelocity) to configure core module dependencies
CommonSurfPlugin.kt	Added dependency configuration logic to include the selected core module as a compile-only dependency
PaperPluginSurfPlugin.kt	Registered surf-core-paper as a required server dependency when core module is present
VelocityPluginFile.kt	Registered surf-core-velocity as a required plugin dependency when core module is present
build.gradle.kts	Incremented plugin version from 1.6.4 to 1.6.5

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