Feature/color macros mordernization

[pointertobios]

Summary by CodeRabbit

• New Features
  • 新增统一的颜色相关头文件，提供颜色类型及打包、拆包、灰度转换等便捷接口。
  • 主头文件和中文头文件已接入新的颜色定义来源，便于直接使用相关能力。
• Chores
  • 更新忽略规则，新增对 .cache/ 目录的忽略。

[coderabbitai]

Walkthrough

将颜色类型 color_t 与相关宏从 include/ege.h 和 include/ege.zh_CN.h 中移除，新建 include/ege/color.h，以 inline constexpr 函数重新实现颜色打包/拆包/灰度转换，并通过 using 引入全局作用域。两个原有头文件改为 #include "ege/color.h"。

Changes

颜色定义提取到独立头文件

Layer / File(s)	Summary
新增 include/ege/color.h include/ege/color.h	在 namespace ege 内以 inline constexpr 函数实现 color_t 类型定义、颜色分量打包（EGERGBA/EGERGB/EGEARGB/EGEACOLOR）、分量提取与 alpha 变换（EGECOLORA/EGEGET_R/G/B/A）以及灰度构造（EGEGRAY/EGEGRAYA/EGEAGRAY），文件末尾用 using ege::... 将各函数引入全局作用域。
原有头文件切换到 ege/color.h include/ege.h, include/ege.zh_CN.h	两个头文件各新增 #include "ege/color.h"，同时删除原内置的 EGE_COLOR_T_TYPEDEF 守卫下的 typedef uint32_t color_t 及全套颜色宏定义块。
.gitignore 更新 .gitignore	新增 .cache/ 忽略规则。

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• x-ege/xege#318：将 COLORS 枚举底层类型改为 color_t，与本 PR 对 color_t 来源的迁移强相关。

Poem

🐇 小兔子捧起颜色盒，
把宏宏们搬进新小屋，
color.h 整整齐齐住，
红绿蓝透再不散落路，
using 一声呼，全家出来啦！

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	标题与本次颜色宏现代化/拆分到独立头文件的主要改动一致，能清楚概括变更方向。
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[augmentcode]

🤖 Augment PR Summary

Summary: This PR modernizes EGE color utilities by moving the color type and helper definitions into a dedicated header.

Changes:

• Adds include/ege/color.h with constexpr color construction/extraction helpers.
• Updates include/ege.h and include/ege.zh_CN.h to include the new header and removes the inlined macro/typedef definitions.
• Exports the helpers into the global namespace via using declarations for drop-in usage.
• Ignores .cache/ directories in .gitignore.

Technical Notes: Switching from macros to constexpr functions avoids macro pitfalls and makes the helpers usable in constant expressions while keeping the same call sites.

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[augmentcode]

Review completed. 2 suggestions posted.

Comment augment review to trigger a new review at any time.

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@include/ege/color.h`:
- Around line 8-12: The public API still refers to bare color_t, but the type
was moved into the ege namespace, so compilation breaks unless it is re-exported
globally. Update include/ege/color.h to add a global using ege::color_t
alongside the existing function re-exports, and make sure the same public-facing
symbol is available to include/ege.h and include/ege.zh_CN.h where color_t is
used.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: a220b8ac-4a33-46c6-bafe-59f6993c4bc5

📥 Commits

Reviewing files that changed from the base of the PR and between e85aa27 and 084f77f.

📒 Files selected for processing (4)

• .gitignore
• include/ege.h
• include/ege.zh_CN.h
• include/ege/color.h