docs: Add comprehensive documentation for Gonfig derive macro

[0xvasanth]

Summary

• Added comprehensive rustdoc documentation for the Gonfig derive macro
• Documented all container-level attributes (env_prefix, allow_cli, allow_config)
• Documented all field-level attributes (env_name, cli_name, default, skip)
• Added configuration priority order explanation
• Included complete usage examples
• Fixed clippy warnings for uninlined format arguments across the codebase

Changes

Documentation

• Added detailed derive macro documentation in gonfig_derive/src/lib.rs
• Included examples for all attributes and use cases
• Documented configuration merging priority

Code Quality

• Fixed all clippy::uninlined_format_args warnings in:
  • src/builder.rs, src/cli.rs, src/config.rs
  • All example files
  • Test files

Test plan

• All existing tests pass
• Clippy passes with -D warnings
• Pre-commit hooks pass
• Documentation changes only for macro docs, no functional changes

[Copilot]

Pull Request Overview

This PR adds comprehensive documentation for the Gonfig derive macro and fixes clippy warnings for uninlined format arguments across the codebase.

• Added detailed rustdoc documentation for all container and field-level attributes
• Fixed clippy::uninlined_format_args warnings by using inline format syntax
• Updated version numbers from 0.1.5 to 0.1.6

Reviewed Changes

Copilot reviewed 14 out of 15 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
gonfig_derive/src/lib.rs	Added comprehensive derive macro documentation with examples for all attributes
src/config.rs	Fixed uninlined format args in error messages
src/cli.rs	Fixed uninlined format args in serialization error
src/builder.rs	Fixed uninlined format args in deserialization error
tests/debug_env.rs	Fixed uninlined format args in debug println
examples/*.rs	Fixed uninlined format args in various print statements
Cargo.toml files	Bumped version from 0.1.5 to 0.1.6

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