dcdpr / jp / 20465234232

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feat(config)!: support configuration extension strategies (#334)

Update the `extends` configuration field to support specifying a merge
strategy for each path. Users can now provide a simple string
(defaulting to `before`) or an object specifying the strategy:

```toml
extends = [
  "base.toml",
  { path = "override.toml", strategy = "after" }
]
```

The available strategies are:
- `before`: Load the extended config before the current file (default).
This allows the current file to override values from the base config.
- `after`: Load the extended config after the current file.

BREAKING CHANGE: The default behavior for `extends` has changed.
Extended configurations are now loaded *before* the current file by
default, whereas previously they were loaded after. This aligns the
behavior with typical inheritance patterns where the child config
overrides the parent.

---------

Signed-off-by: Jean Mertz <git@jeanmertz.com>

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