Add .node mod support and refactor mod loader/manager; fix lexer/parser formatting and team index bug; add tests

[MonthZifang]

Motivation

• Enable loading of Node-based mods and make mod file extension checks robust and case-insensitive.
• Simplify and centralize mod lifecycle handling in the manager/loader and provide a dedicated mod logger.
• Fix representation and formatting of token/operator types and correct team index computation to avoid integer-type issues.

Description

• Add case-insensitive extension handling in internal/mods/loader.go and support .node mods, including aliasing the go package import to gomod and registering a node manager.
• Introduce a package-level modLog logger in internal/mods/types.go and replace calls to the previous Log target with modLog in internal/mods/manager.go, and delegate start/stop to the loader via loader.Start()/loader.Stop() and collect loaded mods into m.mods with collectLoadedModsLocked().
• Improve error handling in Unload to avoid unused variable and normalize JSON marshaling/unmarshaling field naming in loader.go.
• Add unit tests internal/mods/loader_test.go covering loading of .jar, .js, .go, .node (case-insensitive) and disabled/unsupported scenarios.
• Fix string formatting for token and operator types by using %v in internal/logic/lexer.go and internal/logic/parser.go to avoid printing type values incorrectly.
• Fix team color indexing in internal/render/render.go by using int conversions for modulo and negative-index correction to avoid int32 mixing.
• Update example code to use config.PersistConfig instead of persist.Config in examples/双核心集成示例.go.

Testing

• Ran go test ./internal/mods -v which executed TestModLoaderLoadTypes and TestModLoaderDisabledAndUnsupported and both tests passed.

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Codex Task