[CI] Introduce CI job where we check if documentation for public members exist

[Yaraslaut]

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[Copilot]

Pull request overview

This pull request introduces a new CI job to enforce documentation coverage for public members by enabling Doxygen's "warn as error" mode. The PR adds comprehensive documentation comments to public APIs across the codebase to ensure compliance with this new CI check.

Changes:

• Added GitHub Actions workflow job to check documentation coverage using Doxygen with warnings treated as errors
• Updated CMake configuration to support the new LIGHTWEIGHT_DOCS_WARN_AS_ERROR option
• Added missing documentation comments to hundreds of public members across the codebase, including constructors, operators, methods, and fields
• Fixed documentation references in markdown files to use fully-qualified namespace paths

Reviewed changes

Copilot reviewed 48 out of 48 changed files in this pull request and generated 13 comments.

Show a summary per file

File	Description
.github/workflows/build.yml	Added new check_docs CI job to verify documentation coverage
docs/CMakeLists.txt	Added LIGHTWEIGHT_DOCS_WARN_AS_ERROR option and excluded test/tool directories from docs
docs/sql-migrations.md	Fixed documentation references to use fully-qualified namespace paths
docs/dbtool.md	Fixed documentation reference to use fully-qualified namespace path
src/Lightweight/SqlTransaction.hpp	Added documentation for constructors and operators
src/Lightweight/SqlStatement.hpp	Added documentation for methods and operators
src/Lightweight/SqlScopedTraceLogger.hpp	Added documentation for constructors
src/Lightweight/SqlSchema.hpp	Added documentation for struct members and EventHandler methods
src/Lightweight/SqlRealName.hpp	Added documentation for methods, operators, and members
src/Lightweight/SqlQueryFormatter.hpp	Added documentation for methods and members
src/Lightweight/SqlQuery/*.hpp	Added documentation for query builder methods and members
src/Lightweight/SqlMigration.hpp	Added documentation for members and fixed unused parameter warnings
src/Lightweight/SqlLogger.hpp	Added documentation for constructors, operators, and members
src/Lightweight/SqlError.hpp	Added documentation for struct members
src/Lightweight/SqlConnection.hpp	Added documentation for constructors and operators
src/Lightweight/SqlConnectInfo.hpp	Added documentation for members and methods
src/Lightweight/SqlBackup/*.hpp	Added documentation for members, methods, and operators
src/Lightweight/DataMapper/*.hpp	Added documentation for methods, operators, and members
src/Lightweight/DataBinder/*.hpp	Added comprehensive documentation for data types, methods, and operators

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