feat(rt+auth): batched input publish boi so 4 (het crackle) + auto-login loopback khong can mat khau
- fx_realtime: write_input gom FXRT_IN_SLOTS(4) frame vao _in_pending, flush
ghi 1 lan + h.in_write += n (publish atomic -> bridge take=4 luon, het deficit)
- plugins pump: flush_input_stale(0.004) dau vong lap -> input le khong ket
- auth: _is_loopback(127.*/::1/localhost) -> get_current_user khong token = admin
tu DB (must_change_password=False); POST /auth/local auto-login loopback, LAN 403
- ws fx-realtime: loopback khong token cho phep, remote thieu token -> close 4401
- UI: checkAuthStatus khong savedToken -> thu localLogin, thanh cong vao DAW,
that bai -> modal login nhu cu; cache-buster v=202608212400
admin
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