how datadir is used in the combined/

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add support of providing a file of the sqlite storage if sqlite engine is specified in combined/ for store, authStore and activityStore

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[Request interrupted by user for tool use]

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we need to chevck if teh user provided query params to the file after ?

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[Request interrupted by user for tool use]

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question, do we need to do the query separation for activity store?

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summarize the changes in a short pr description

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Verify each finding against the current code and only fix it if needed.

In `@combined/cmd/config.go` around lines 572 - 574, The assignment of
c.Server.AuthStore.File to authStorageFile should resolve relative paths against
mgmt.DataDir so the auth DB lives under the management data directory like the
other sqlite stores; update the logic where authStorageFile is set (referencing
c.Server.AuthStore.File and authStorageFile) to check if the value is non-empty
and not an absolute path (use filepath.IsAbs) and if so join it with
mgmt.DataDir (use filepath.Join and optionally filepath.Clean) before assigning;
keep absolute paths unchanged.

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Relative paths like "custom_idp.db" are now resolved against mgmt.DataDir