dcdpr / jp / 26629106715

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fix(config): Correct field paths for flattened structs (#688)

When walking `AppConfig` fields to produce the list of settable config
paths, flattened nested structs were being treated as regular fields.
This caused their sub-fields to appear under a doubled-up path (e.g.
`conversation.tools.tools`) instead of the correct path that matches the
actual TOML/JSON shape users write.

Flattened fields (those marked with `#[setting(flatten)]`) now inherit
the parent prefix rather than appending their own name, so the resolved
paths match the wire format. The snapshot for `AppConfig::fields()`
reflects this: `conversation.tools.tools` is corrected to
`conversation.tools`.

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

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