case 4694 - standalone setup stops a running embedded PostgreSQL first

The 8.2.4 and older launchers left PostgreSQL running after the in-app
shutdown, so every standalone upgrade stopped at "files in use" and could not
close it. PrepareToInstall and uninstall now run the installed pg_ctl stop.
Changelog; BUILD.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

dist/install/windows/x64/standalone.iss

@@ -87,8 +87,28 @@ Filename: "{sys}\icacls.exe"; Parameters: """{app}"" /remove:g *S-1-5-32-545 /T
 Filename: "{app}\launcher\ayanova-launcher.exe"; Description: "{cm:LaunchProgram,{#StringChange(MyAppName, '&', '&&')}}"; Flags: nowait postinstall skipifsilent
 
 [Code]
+// case 4694: the launcher of 8.2.4 and older left the local PostgreSQL server running when AyaNova was shut down, so
+// its files are in use; stop it (if running) before installing over it or uninstalling
+procedure StopLocalPostgres();
+var
+  PgCtl: String;
+  ResultCode: Integer;
+begin
+  PgCtl := ExpandConstant('{app}\local-postgres\bin\pg_ctl.exe');
+  if FileExists(PgCtl) and DirExists(ExpandConstant('{commonappdata}\ayanova\database')) then
+    Exec(PgCtl, 'stop -D "' + ExpandConstant('{commonappdata}\ayanova\database') + '" -m fast -w', ExtractFileDir(PgCtl), SW_HIDE, ewWaitUntilTerminated, ResultCode);
+end;
+
+function PrepareToInstall(var NeedsRestart: Boolean): String;
+begin
+  StopLocalPostgres();
+  Result := '';
+end;
+
 procedure CurUninstallStepChanged(CurUninstallStep: TUninstallStep);
 begin
+  if CurUninstallStep = usUninstall then
+    StopLocalPostgres();
   if CurUninstallStep = usPostUninstall then
   begin
     if MsgBox('Do you want to delete all AyaNova database, attachment and log files?', mbConfirmation, MB_YESNO or MB_DEFBUTTON2) = IDYES then