Add Minecraft 26.2 Forge support

[Gordonynh]

Summary

• update the Minecraft target from 1.21.11 to 26.2
• update the Java toolchain to 25 and Forge to 65.0.3
• adapt Baritone API, world/chunk access, rendering, inventory, command, pathing, builder, and mixin code to the 26.2 mappings
• update Forge metadata and produce standalone/API Forge artifacts

Verification

• JAVA_HOME=$(brew --prefix openjdk@25)/libexec/openjdk.jdk/Contents/Home ./gradlew clean test build
• build completed successfully, including Forge remap, ProGuard, and distribution tasks

[Gordonynh]

Codacy appears to be failing internally rather than reporting a code issue. Its public analysis API reports zero issues, while the analysis log shows Preparing Source Code: success, followed by Diff: error and Deltas: error. The same Diff/Deltas failure currently affects the other open PRs targeting 1.21.11 (including #5074, #5062, #5061, #5042, and #4990), whereas checks on PRs targeting 1.19.4 complete normally.

The commit graph for this PR is intact (7506445 directly parents the current 1.21.11 head, 775f4ca). This likely needs a Codacy re-run/configuration fix or a maintainer bypass rather than a source change.