Fix: eliminate extra screen restarts on connection init

Two changes to reduce unnecessary CScreenSpy restarts when connecting:

1. Client (ScreenManager.cpp): Initialize CScreenSpy with bitrate from
   the locally-saved quality profile, so CMD_QUALITY_LEVEL arriving from
   the server (same bitrate as default) hits SetBitRate(3000)==3000 and
   skips the restart instead of comparing against the hard-coded 0.
   Also fixes QualityLevel init to use the already-computed `quality`
   variable (which honours the QUALITY_DISABLED override when algo!=NUL)
   rather than re-reading the cfg key a second time.

2. Server (ScreenSpyDlg.cpp): Only send CMD_SCREEN_SIZE strategy=2 when
   the session is in QUALITY_ADAPTIVE mode and a cached maxWidth exists.
   Fixed quality levels already carry resolution via CMD_QUALITY_PROFILES,
   so unconditionally sending CMD_SCREEN_SIZE caused a second restart when
   the screen spy was still rebuilding from the first one.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/2015Remote/ScreenSpyDlg.cpp

@@ -856,11 +856,12 @@ BOOL CScreenSpyDlg::OnInitDialog()
         BYTE cmd[4] = { CMD_QUALITY_LEVEL, (BYTE)m_AdaptiveQuality.currentLevel, 0 };
         m_ContextObject->Send2Client(cmd, sizeof(cmd));
 
-        // 始终发送 CMD_SCREEN_SIZE，让客户端同步分辨率策略
-        // maxWidth=0 表示使用默认分辨率（1080p 限制）
-        BYTE sizeCmd[16] = { CMD_SCREEN_SIZE, 2 };  // strategy=2 表示自适应质量
-        memcpy(sizeCmd + 2, &m_AdaptiveQuality.currentMaxWidth, sizeof(int));
-        m_ContextObject->Send2Client(sizeCmd, 10);
+        // 仅在自适应模式且有缓存宽度时同步分辨率，固定等级分辨率由 profile 决定无需重发
+        if (m_Settings.QualityLevel == QUALITY_ADAPTIVE && m_AdaptiveQuality.currentMaxWidth > 0) {
+            BYTE sizeCmd[16] = { CMD_SCREEN_SIZE, 2 };  // strategy=2 = 自适应质量
+            memcpy(sizeCmd + 2, &m_AdaptiveQuality.currentMaxWidth, sizeof(int));
+            m_ContextObject->Send2Client(sizeCmd, 10);
+        }
     }
 
     SendNext();