fix tag duel init

[mercury233]

No description provided.

[Copilot]

Pull request overview

This PR fixes initialization issues in the Tag Duel mode by moving member initialization into in-class initializers and defaulting special member functions, ensuring deterministic startup state. It also applies the same cleanup style to Single Duel and removes redundant inline specifiers on out-of-line method definitions.

Changes:

• Initialize TagDuel’s pointer/flag/counter/time-tracking members via in-class initializers and default the ctor/dtor.
• Default SingleDuel’s destructor (no-op) for consistency/clarity.
• Remove redundant inline from WriteUpdateData definitions in .cpp files.

Reviewed changes

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

File	Description
gframe/tag_duel.h	Adds in-class member initialization to ensure TagDuel starts from a well-defined state.
gframe/tag_duel.cpp	Replaces manual constructor initialization with = default and removes redundant inline on an out-of-line definition.
gframe/single_duel.h	Whitespace-only cleanup at file end.
gframe/single_duel.cpp	Defaults a trivial destructor and removes redundant inline on an out-of-line definition.

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