硬编码路径优化完成 (#117)

已成功完成对硬编码路径的参数化优化。

## 修改内容

**文件：** `rule/datapack.bzl`

**变更：** 将第383行的硬编码路径 `data/minecraft/tags/functions` 参数化
- 添加了两个局部常量 `_MINECRAFT_TAGS_FUNCTIONS_PREFIX` 和
`_MINECRAFT_TAGS_FUNCTION_STRIP_PREFIX`
- 更新了 `pkg_files` 调用，使用变量替代硬编码字符串
- 保持了与原有 `strip_prefix` 路径的一致性

**具体变更：**
```python
# 定义 Minecraft 标签路径常量
_MINECRAFT_TAGS_FUNCTIONS_PREFIX = "data/minecraft/tags/functions"
_MINECRAFT_TAGS_FUNCTION_STRIP_PREFIX = "data/minecraft/tags/function"

pkg_files(
    name = name + "_function_tag_legacy",
    visibility = visibility,
    srcs = [":%s_function_tag_legacy_compress" % name],
    prefix = _MINECRAFT_TAGS_FUNCTIONS_PREFIX,
    strip_prefix = _MINECRAFT_TAGS_FUNCTION_STRIP_PREFIX,
)
```

## 验证结果

- ✅ 语法检查通过：`bazel query` 验证目标存在
- ✅ 构建测试通过：`bazel build
//subprojects/stone-disappearance:stone-disappearance` 成功构建
- ✅ 无破坏性变更：现有构建流程保持不变

## 优化效果

1. **提高可维护性**：路径集中管理，未来修改只需更新常量
2. **提升代码清晰度**：使用有意义的变量名替代魔术字符串
3. **保持向后兼容**：不改变现有构建行为，所有数据包构建不受影响

本次优化完成了 Issue 中提出的低优先级改进要求，使构建系统代码更加健壮和可维护。

Closes #115

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Author: WhiteElephant-abc

rule/datapack.bzl

@@ -394,12 +394,16 @@ def _datapack_impl(
         srcs = function_tags,
     )
 
+    # 定义 Minecraft 标签路径常量
+    _MINECRAFT_TAGS_FUNCTIONS_PREFIX = "data/minecraft/tags/functions"
+    _MINECRAFT_TAGS_FUNCTION_STRIP_PREFIX = "data/minecraft/tags/function"
+
     pkg_files(
         name = name + "_function_tag_legacy",
         visibility = visibility,
         srcs = [":%s_function_tag_legacy_compress" % name],
-        prefix = "data/minecraft/tags/functions",
-        strip_prefix = "data/minecraft/tags/function",
+        prefix = _MINECRAFT_TAGS_FUNCTIONS_PREFIX,
+        strip_prefix = _MINECRAFT_TAGS_FUNCTION_STRIP_PREFIX,
     )
 
     pkg_filegroup(