docs: document Command System V2 and Atelier REPL

[CedaryCat]

Summary by Sourcery

Document Command System V2 and the Atelier REPL across the developer docs and README, and bump the project version for the next release.

Build:

• Update GitVersion configuration to bump the next-version from v0.2.1 to v0.3.1.

Documentation:

• Add detailed plugin developer documentation for Command System V2, including controller declarations, parameter binding, flags, guards, TShock-specific bindings, and installation/uninstallation, in both English and Chinese guides.
• Introduce a new section describing Atelier REPL usage, session model, meta-commands, and best practices in the plugin dev guide in both English and Chinese.
• Explain Command System V2 and Atelier REPL as core subsystems in the developer overview docs, with deep-dive implementation details and architectural best practices, in both English and Chinese.
• Highlight Command System V2 and Atelier REPL as headline features in the main README and docs README, and reference where to find more detailed guides.

[sourcery-ai]

Reviewer's Guide

Documents the new Command System V2 and Atelier REPL across English and Chinese developer docs, surfaces them in the top-level READMEs, and bumps the GitVersion next-version to v0.3.1.

File-Level Changes

Change	Details	Files
Add detailed Command System V2 documentation to the plugin development guides (EN/ZH).	Extend dev-plugin table of contents with a new Command System V2 section and subsections. Document controller declaration, parameter binding, flags, guards/permissions, TShock-specific bindings, and installation/uninstallation patterns with code examples. Clarify architectural relationship between the neutral UTSL command engine and the TShock integration layer, including best-practice guidance for plugin authors.	docs/dev-plugin.md docs/dev-plugin.zh-cn.md
Describe Command System V2 and Atelier REPL as core subsystems in the developer overview docs (EN/ZH).	Add CommandSystem and Atelier REPL entries to the core services list, including their roles in the architecture. Introduce new subsections that deep-dive Command System V2 and Atelier REPL internals with layered architecture, data flow, and best practices. Link these new sections from the overview TOCs for easier navigation.	docs/dev-overview.md docs/dev-overview.zh-cn.md
Expose Command System V2 and Atelier REPL in the top-level README feature lists and plugin guidance (EN/ZH).	Extend feature tables to highlight Command System V2 and Atelier REPL capabilities and positioning. Add a short recommendation that plugins should use Command System V2 for commands, noting discovery, binding, permissions, and help/audit integration. Mention Atelier REPL as the preferred way to inspect/script against a running world without writing a full plugin, with pointers to the detailed docs.	README.md docs/README.zh-cn.md
Bump GitVersion configuration to the next documented version.	Update the configured next-version from v0.2.1 to v0.3.1 to reflect the new feature set.	GitVersion.yml

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Hey - I've reviewed your changes and they look great!

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