fix(xhttp): stop injecting scMaxEachPostBytes/scMinPostsIntervalMs defaults (#5141)

The panel seeded xhttp configs with scMaxEachPostBytes=1000000 and
scMinPostsIntervalMs=30 — xray-core''s own defaults — and emitted them
into every generated config and share link. The literal
scMinPostsIntervalMs=30 is a stable DPI fingerprint that Russia''s TSPU
keys on to block connections on mobile networks.

New configs no longer seed these values (empty schema/template defaults,
so xray-core applies its internal defaults). For configs already stored
with the old defaults, the link/subscription builders now drop values
equal to xray-core''s defaults instead of advertising them — covering
panel share links, the raw subscription, and the JSON subscription
without requiring every inbound to be re-saved. Non-default values the
user set deliberately are still emitted.

.gitattributes

@@ -8,3 +8,4 @@ DockerEntrypoint.sh text eol=lf
 # with core.autocrlf=true doesn't show phantom CRLF-only "modified" diffs.
 frontend/src/generated/** text eol=lf
 frontend/public/openapi.json text eol=lf
+frontend\src\test\__snapshots__\** text eol=lf