Phase 5 (D4): headless daemon entry point (ewsdrd)

ewsdrd.lpr — a console daemon that runs TRadioController + TWebAdapter WITHOUT
TMainForm/LCL, proving the Phase-5 goal: web-only headless operation. THeadlessHost
wires the data-path callbacks to the controller, the web command handlers to the
adapter (lifecycle ones marshalled to the main thread via FCtrl.Invoke =
TThread.Synchronize), opens WDSP synchronously, autostarts the saved device, and
runs a CheckSynchronize + periodic PushState loop. SIGINT/SIGTERM → graceful
StopAndDisconnect (persist + Run=0).

To keep the controller graph truly LCL-free, PlatformUtils now guards its only
Forms dependency (Screen.PixelsPerInch in CurrentScreenDPI) behind {$IFNDEF
HEADLESS}; the GUI build is byte-identical (HEADLESS undefined). build-ewsdrd.sh
compiles the headless graph from source with -Mobjfpc (nested comments) -dHEADLESS
into a separate lib-headless/ output dir, untouching the GUI .ppu.

Verified: builds clean; runs headless, web server up (HTTP 401 = serving), no LCL;
SIGINT shuts down gracefully. Radio-connect + web round-trip need hardware to test.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

build-ewsdrd.sh

@@ -0,0 +1,22 @@
+#!/bin/sh
+# Сборка headless-демона ewsdrd (только Web-управление, без LCL/виджетсета).
+#
+# Компилирует headless-граф ИЗ ИСХОДНИКОВ с -dHEADLESS в ОТДЕЛЬНЫЙ каталог
+# (lib-headless/...), чтобы не трогать .ppu GUI-сборки. Ключевое:
+#   -Mobjfpc  — командный режим по умолчанию: включает nested comments, нужные
+#               для лидирующих комментариев Settings.pas (юниты дальше сами ставят
+#               свой {$mode} директивой; программа — {$MODE Delphi}).
+#   -dHEADLESS — PlatformUtils не тянет Forms (LCL), граф остаётся LCL-free.
+# libwdsp.dylib должна лежать в /usr/local/lib.
+set -e
+ROOT=$(cd "$(dirname "$0")" && pwd)
+cd "$ROOT"
+CPU=$(fpc -iTP)
+OS=$(fpc -iTO)
+OUTUNITS="lib-headless/${CPU}-${OS}"
+OUT="bin/${CPU}-${OS}"
+mkdir -p "$OUTUNITS" "$OUT"
+fpc -Mobjfpc -O3 -dHEADLESS \
+    -Fu"$ROOT" -FU"$OUTUNITS" -k-L/usr/local/lib \
+    -o"$OUT/ewsdrd" ewsdrd.lpr
+echo "Built: $OUT/ewsdrd"