[1.21.1-NEO] Fix crash without advanced AE

[kuba6000]

Resolves #47

[Copilot]

Pull request overview

Fixes the startup crash reported in issue #47 by ensuring mixins that reference AdvancedAE classes are only loaded/applied when the AdvancedAE mod is actually present.

Changes:

• Removes AdvancedAE class references from the always-applied AE2 crafting CPU cluster mixin and retargets it to AE2’s CraftingCPUCluster.
• Introduces a new AdvancedAE-only mixin (AdvCraftingCPUMixin) that implements ICraftingCPUCluster for AdvCraftingCPU.
• Updates the mixin plugin to register the new AdvancedAE mixin only when advanced_ae is detected.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/main/java/pl/kuba6000/ae2webintegration/ae2interface/mixins/advanced_ae/CraftingCPULogicMixin.java	Minor class declaration tweak for the AdvancedAE crafting CPU logic mixin.
src/main/java/pl/kuba6000/ae2webintegration/ae2interface/mixins/advanced_ae/AdvCraftingCPUMixin.java	Adds an AdvancedAE-only implementation of ICraftingCPUCluster for AdvCraftingCPU.
src/main/java/pl/kuba6000/ae2webintegration/ae2interface/mixins/MixinPlugin.java	Registers the new AdvancedAE-only mixin when advanced_ae is present.
src/main/java/pl/kuba6000/ae2webintegration/ae2interface/mixins/AE2/implementations/AECraftingCPUClusterMixin.java	Removes the AdvancedAE branch and targets AE2 CraftingCPUCluster directly to prevent CNFE when AdvancedAE is missing.

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