* fix(subscriptions): avoid shared mutable state during generation
* fix(subscriptions): serve external-link-only subs in JSON/Clash; load remark settings per request
The ForRequest refactor added an early `len(inbounds) == 0` return to
GetJson/GetClash that fired before external links were fetched, so a
subscription whose only entries are external links (or whose inbounds are
all disabled) rendered empty in the JSON and Clash formats. Drop the
premature check — the existing inbounds+externalLinks empty guard already
covers the truly-empty case.
Also load datepicker/emailInRemark in PrepareForRequest rather than only in
getSubs, so JSON and Clash remarks honor these settings instead of seeing
the zero values (emailInRemark previously depended on the shared-state leak
this PR fixes).
Add a regression test covering an external-link-only sub across both formats.
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Co-authored-by: Sanaei <ho3ein.sanaei@gmail.com>
n0ctal