Fix: Client log dialog stops updating past edit-control default limit

The Win32 EDIT control caps text at ~32K/64K chars by default, so the
client log dialog silently stopped accepting appends long before the
512KB truncation logic could run. Call SetLimitText(0) in both
CClientLog and CActivityDialog to lift the cap.

Also unify newline handling in Logger: each entry now ends with exactly
one '\n' at the source, so the in-memory ring-buffer dump (used by the
TCP log query) splits into lines correctly instead of relying on every
Mprintf caller ending its format with '\n'. writeToFile drops the extra
std::endl accordingly.

Additionally fix a CFont leak in CClientLog::OnInitDialog by moving the
font to a member.

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

server/2015Remote/CClientLog.cpp

@@ -37,9 +37,9 @@ BOOL CClientLog::OnInitDialog()
     HICON hIcon = AfxGetApp()->LoadIcon(IDI_CLIENTLOG);
     SetIcon(hIcon, TRUE);
     SetIcon(hIcon, FALSE);
-    CFont* pFont = new CFont();
-    pFont->CreatePointFont(85, _T("Consolas"));
-    m_editLog.SetFont(pFont);
+    m_font.CreatePointFont(85, _T("Consolas"));
+    m_editLog.SetFont(&m_font);
+    m_editLog.SetLimitText(0);   // 解除 EDIT 控件默认长度上限，改由 AppendLog 的 512KB 逻辑管理
     return TRUE;
 }