docs: engine plugin system for game-engine agnostic orchestration

[frostebite]

Summary

Documents the new engine plugin system from game-ci/orchestrator#4 that makes the orchestrator game-engine agnostic.

• New page: Advanced Topics > Engine Plugins — full guide covering the EnginePlugin interface, plugin sources (npm module, CLI executable, Docker image), and how to author plugins
• Updated introduction to mention engine agnosticism as a key benefit
• Updated caching page to reference engine-aware cache folders instead of hardcoded "Library"
• Added engine and enginePlugin to API reference parameters
• Added --engine and --engine-plugin to CLI build command docs

Changes

File	Change
01-introduction.mdx	Mention engine agnosticism in intro paragraph and benefits table
05-api-reference.mdx	New Engine parameters section
07-advanced-topics/01-caching.mdx	Reference engine plugin for cache folders
07-advanced-topics/18-engine-plugins.mdx	New full page
08-cli/02-build-command.mdx	New Engine Options section with example

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Visit the preview URL for this PR (updated for commit 0feb581):

https://game-ci-5559f--pr544-docs-engine-plugins-8hnqwoz2.web.app

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[frostebite]

Merged into release/lts-2.0.0. Related orchestrator PR: game-ci/orchestrator#4