📝 Add docstrings to double-pin

[coderabbitai]

Docstrings generation was requested by @VictoriousRaptor.

• Double pinyin query #2427 (comment)

The following files were modified:

• Flow.Launcher.Infrastructure/IAlphabet.cs
• Flow.Launcher.Infrastructure/PinyinAlphabet.cs
• Flow.Launcher.Infrastructure/StringMatcher.cs
• Flow.Launcher.Infrastructure/TranslationMapping.cs

These file types are not supported

• Flow.Launcher/Flow.Launcher.csproj
• Flow.Launcher/Resources/double_pinyin.json

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CodeRabbit cannot perform edits on its own pull requests yet.

[github-actions]

@check-spelling-bot Report

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❌ Errors and Warnings	Count
❌ forbidden-pattern	22
⚠️ non-alpha-in-dictionary	13

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[gitstream-cm]

🥷 Code experts: VictoriousRaptor, Jack251970

VictoriousRaptor, Jack251970 have most 👩‍💻 activity in the files.
VictoriousRaptor, jjw24 have most 🧠 knowledge in the files.

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Flow.Launcher.Infrastructure/IAlphabet.cs

Activity based on git-commit:

	VictoriousRaptor	Jack251970
JUN
MAY
APR
MAR
FEB
JAN

Knowledge based on git-blame:
VictoriousRaptor: 100%

Flow.Launcher.Infrastructure/PinyinAlphabet.cs

Activity based on git-commit:

	VictoriousRaptor	Jack251970
JUN	110 additions & 165 deletions
MAY
APR		43 additions & 41 deletions
MAR
FEB
JAN		7 additions & 1 deletions

Knowledge based on git-blame:
VictoriousRaptor: 79%
jjw24: 1%

Flow.Launcher.Infrastructure/StringMatcher.cs

Activity based on git-commit:

	VictoriousRaptor	Jack251970
JUN
MAY
APR		2 additions & 2 deletions
MAR
FEB		7 additions & 4 deletions
JAN		18 additions & 11 deletions

Knowledge based on git-blame:
jjw24: 62%
VictoriousRaptor: 2%

Flow.Launcher.Infrastructure/TranslationMapping.cs

Activity based on git-commit:

	VictoriousRaptor	Jack251970
JUN
MAY
APR		22 additions & 18 deletions
MAR
FEB
JAN

Knowledge based on git-blame:
VictoriousRaptor: 77%

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Be a legend 🏆 by adding a before and after screenshot of the changes you made, especially if they are around UI/UX.