[Chore] Merge `release/4.2.1` to `main`#1920

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JiahuiWho merged 6 commits intomainfrom

merge-4.2.1-to-main

Apr 8, 2026

Commits on Mar 24, 2026

[Chore] Merge main to develop (#1914)
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Commits on Mar 30, 2026

[ANCHOR-1173] Fix blind SSRF in SEP-10 client_domain resolution (#1915)
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Commits on Apr 3, 2026

[ANCHOR-1179] Fix SEP-12 IDOR via transaction_id in customer endpoints (#1916)
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Commits on Apr 8, 2026

[ANCHOR-1185] Add XDR size validation in SEP-10 and SEP-45 auth endpoint (#1917)
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[Chore] Bump version to 4.2.1 (#1919)
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[ACNHOT-1186] Fix `MEMO_ID` validation to support full Stellar uint64 range (#1918)
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