chore: v1.8.4 — adaptive batch coalescing + tunnel-node long-poll fixes

Two PRs from @yyoyoian-pixel field-tested in Iran:

- #448: adaptive batch coalescing replaces fixed 8ms window. P75 RTT
  6.2s → 3.0s in Iran network testing. Configurable via
  coalesce_step_ms / coalesce_max_ms.

- #446: tunnel-node long-poll 5s → 15s for Telegram/Google Push
  persistent connection stability. Adaptive 40ms-step / 500ms-max
  straggler settle replaces fixed 30ms.

Includes desktop UI build fix: round-trip the new coalesce_* fields
through to_config(). Desktop UI sliders queued for v1.8.x batch.

Author: therealaleph

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "mhrv-rs"
-version = "1.8.3"
+version = "1.8.4"
 edition = "2021"
 description = "Rust port of MasterHttpRelayVPN -- DPI bypass via Google Apps Script relay with domain fronting"
 license = "MIT"

Cargo.toml

@@ -0,0 +1,8 @@
+<!-- see docs/changelog/v1.1.0.md for the file format: Persian, then `---`, then English. -->
+• **adaptive batch coalescing** برای کاهش تعداد Apps Script roundtrip‌ها (PR [#448](https://github.com/therealaleph/MasterHttpRelayVPN-RUST/pull/448) از @yyoyoian-pixel): قبلاً هر op فقط ۸ms برای op‌های هم‌زمان دیگر صبر می‌کرد + اکثراً batchها فقط ۱ op داشتن. حالا scheme adaptive: اولین op یک timer ۴۰ms استارت می‌زنه، op‌های جدید reset می‌کنن، اگر ۴۰ms idle شد batch fire می‌شه. cap نهایی ۱۰۰۰ms. نتیجه field test روی شبکه ایران: ops/batch از ۱.۰ به ۲-۳، P75 RTT از ۶.۲s به ۳.۰s، کاهش ~۵۰٪ Apps Script call. configurable از طریق `coalesce_step_ms` / `coalesce_max_ms` در config + در Android UI Advanced section با slider
+• **tunnel-node long-poll از ۵s به ۱۵s** برای پایداری Telegram + Google Push (PR [#446](https://github.com/therealaleph/MasterHttpRelayVPN-RUST/pull/446) از @yyoyoian-pixel): قبلاً connection‌های persistent (Telegram XMPP پورت ۵۲۲۲، Google Push پورت ۵۲۲۸) هر ۵ ثانیه empty-response برمی‌گرفتن + apps این رو instability تفسیر می‌کردن + session reconnect می‌زدن. هر reconnect معادل یک TLS handshake کامل (~۴s از طریق Apps Script) یعنی buffering قابل مشاهده در تماس Telegram یا playback. حالا long-poll تا ۱۵ ثانیه باز می‌مونه + persistent connection پایدار می‌مونه
+• **adaptive straggler settle** در tunnel-node (PR [#446](https://github.com/therealaleph/MasterHttpRelayVPN-RUST/pull/446)): قبلاً fixed ۳۰ms wait بعد از اولین session که data داشت. حالا adaptive ۴۰ms-step تا ۵۰۰ms-max که زود break می‌شه اگر همه session‌ها ready باشن. در شبکه‌های latency بالا (~۱.۵s Apps Script overhead) packing بیشتر session response در یک batch، quota مصرف کم‌تری ایجاد می‌کنه
+---
+• **Adaptive batch coalescing** to reduce Apps Script round-trip count (PR [#448](https://github.com/therealaleph/MasterHttpRelayVPN-RUST/pull/448) by @yyoyoian-pixel): the previous fixed 8ms coalesce window barely caught concurrent ops — most batches were a single op. The new adaptive scheme starts a 40ms timer on first arrival, resets on each new op, fires the batch when the window stays empty, with a hard 1000ms cap. Field testing on a network in Iran showed ops/batch went from ~1.0 to 2-3, P75 RTT 6.2s → 3.0s, fast (<3s) batches 61% → 74-85%, total Apps Script calls roughly halved. Both values configurable via `coalesce_step_ms` / `coalesce_max_ms` in `config.json` and via sliders in the Android UI's Advanced section. Desktop UI sliders are queued for the v1.8.x desktop UI batch alongside the system-proxy toggle (#432).
+• **tunnel-node long-poll raised from 5s to 15s** for persistent-connection stability (PR [#446](https://github.com/therealaleph/MasterHttpRelayVPN-RUST/pull/446) by @yyoyoian-pixel): at 5s long-poll, persistent connections like Telegram XMPP (`:5222`) and Google Push (`mtalk.google.com:5228`) interpreted the frequent empty-poll returns as connection instability and rotated sessions. Each reconnect cost a full TLS handshake (~4s through Apps Script), causing visible interruptions during Telegram video/voice calls and media playback. The 15s long-poll holds the response open until server data actually arrives, keeping persistent sessions alive without unnecessary re-handshakes.
+• **Adaptive straggler settle in tunnel-node** (PR [#446](https://github.com/therealaleph/MasterHttpRelayVPN-RUST/pull/446)): the previous fixed 30ms straggler settle was too short to catch neighboring sessions with data. Replaced with adaptive 40ms-step / 500ms-max settle that breaks early when all sessions in a batch have data. On high-latency relays (~1.5s Apps Script overhead per call), packing more session responses into one batch saves quota; the early-break prevents wasted time when all data is already ready.

docs/changelog/v1.8.4.md

@@ -536,6 +536,13 @@ impl FormState {
             // added) so save doesn't drop them.
             tunnel_doh: self.tunnel_doh,
             bypass_doh_hosts: self.bypass_doh_hosts.clone(),
+            // PR #448 (Android): adaptive coalesce window. Desktop UI
+            // doesn't expose sliders for these yet (Android does), so
+            // we pass 0 to keep the compiled defaults (40ms step,
+            // 1000ms max). Round-trip planned for the v1.8.x desktop UI
+            // batch alongside the system-proxy toggle (#432).
+            coalesce_step_ms: 0,
+            coalesce_max_ms: 0,
         })
     }
 }