feat: 支持按键分离事件与键盘捕获，并优化UI

- 后端与前端新增 keyAction 参数，支持按键按下/抬起独立事件，保持向下兼容
- 前端控制栏支持 pointerdown/pointerup 长按，新增键盘捕获输入框，映射浏览器按键到 Android KeyEvent
- 重构顶栏布局：用户区右置并添加在线指示器、状态文本省略，优化窄屏响应式表现
- 控制栏录制按钮组防拆行，分辨率/帧率选择器自适应收缩，全局样式增强
- 修复 AdminAuthFilter 中 doFilter 被异常捕获导致误返回 401 的问题
- 移除管理后台中用户 admin 角色及相关 UI 与 API
- 更新信令前端环境代理地址，修正路由名称大小写

WebRTCControlled/app/src/main/java/com/ttstd/controlled/input/AccessibilityInputUtils.java

@@ -53,7 +53,7 @@ public class AccessibilityInputUtils implements InputExecutor {
     }
 
     @Override
-    public void injectKeyEvent(int keyCode) {
+    public void injectKeyEvent(int keyCode, int keyAction) {
         KeyboardAccessibilityService svc = getService();
         if (svc == null) {
             Log.w(TAG, "Accessibility service not running, cannot inject key");

WebRTCControlled/app/src/main/java/com/ttstd/controlled/input/InputCommandHandler.java

@@ -133,8 +133,13 @@ public class InputCommandHandler {
 
     private void handleKey(ControlMessage command) {
         int keyCode = command.getKeyCode();
-        Log.d(TAG, "Key press: " + keyCode);
-        inputExecutor.injectKeyEvent(keyCode);
+        if (keyCode == 0) {
+            Log.w(TAG, "Ignoring KEY command with keyCode=0");
+            return;
+        }
+        int keyAction = command.getKeyAction();
+        Log.d(TAG, "Key press: keyCode=" + keyCode + ", keyAction=" + keyAction);
+        inputExecutor.injectKeyEvent(keyCode, keyAction);
     }
 
     private void handleSwipe(ControlMessage command) {

WebRTCControlled/app/src/main/java/com/ttstd/controlled/input/InputExecutor.java

@@ -7,7 +7,12 @@ public interface InputExecutor {
     void injectTap(int x, int y);
     void injectLongPress(int x, int y);
     void injectSwipe(int x1, int y1, int x2, int y2, long duration);
-    void injectKeyEvent(int keyCode);
+    /**
+     * 注入按键事件。
+     * @param keyCode   Android KeyEvent 键值（如 KeyEvent.KEYCODE_A）。
+     * @param keyAction 动作：0=ACTION_DOWN，1=ACTION_UP；传 -1 表示“按下并立即抬起”的一次性点击（兼容旧行为）。
+     */
+    void injectKeyEvent(int keyCode, int keyAction);
     void injectMotionEvent(int action, int x, int y);
 
     /**

WebRTCControlled/app/src/main/java/com/ttstd/controlled/input/RootShellInputUtils.java

@@ -31,7 +31,7 @@ public class RootShellInputUtils implements InputExecutor {
     }
 
     @Override
-    public void injectKeyEvent(int keyCode) {
+    public void injectKeyEvent(int keyCode, int keyAction) {
         executeRootCommand(String.format(Locale.US, "input keyevent %d", keyCode));
     }
 

WebRTCControlled/app/src/main/java/com/ttstd/controlled/input/ShellInputUtils.java

@@ -25,7 +25,7 @@ public class ShellInputUtils implements InputExecutor {
     }
 
     @Override
-    public void injectKeyEvent(int keyCode) {
+    public void injectKeyEvent(int keyCode, int keyAction) {
         executeShellCommand(String.format(Locale.US, "input keyevent %d", keyCode));
     }
 

WebRTCControlled/app/src/main/java/com/ttstd/controlled/input/SystemInputUtils.java

@@ -2,6 +2,7 @@ package com.ttstd.controlled.input;
 
 import android.os.SystemClock;
 import android.util.Log;
+import android.util.SparseLongArray;
 import android.view.InputDevice;
 import android.view.InputEvent;
 import android.view.KeyEvent;
@@ -21,6 +22,7 @@ public class SystemInputUtils implements InputExecutor {
     private static final int INJECT_INPUT_EVENT_MODE_ASYNC = 0;
     private static final int INJECT_INPUT_EVENT_MODE_WAIT_FOR_FINISH = 2;
     private long mDownTime;
+    private final SparseLongArray mKeyDownTimes = new SparseLongArray();
 
     public SystemInputUtils() {
         try {
@@ -69,10 +71,28 @@ public class SystemInputUtils implements InputExecutor {
     }
 
     @Override
-    public void injectKeyEvent(int keyCode) {
+    public void injectKeyEvent(int keyCode, int keyAction) {
+        if (mInputManager == null || mInjectInputEventMethod == null) {
+            return;
+        }
         long now = SystemClock.uptimeMillis();
-        injectKeyEvent(now, now, KeyEvent.ACTION_DOWN, keyCode);
-        injectKeyEvent(now, SystemClock.uptimeMillis(), KeyEvent.ACTION_UP, keyCode);
+        if (keyAction < 0) {
+            // 向后兼容：未指定动作时执行“按下并立即抬起”的一次性点击
+            injectKeyEvent(now, now, KeyEvent.ACTION_DOWN, keyCode);
+            injectKeyEvent(now, now, KeyEvent.ACTION_UP, keyCode);
+            return;
+        }
+        int action = (keyAction == 0) ? KeyEvent.ACTION_DOWN : KeyEvent.ACTION_UP;
+        long downTime;
+        if (action == KeyEvent.ACTION_DOWN) {
+            downTime = now;
+            mKeyDownTimes.put(keyCode, downTime);
+        } else {
+            // 抬起时复用按下时刻，保证同一次按键周期内 downTime 一致（用于长按/组合键识别）
+            downTime = mKeyDownTimes.get(keyCode, now);
+            mKeyDownTimes.delete(keyCode);
+        }
+        injectKeyEvent(downTime, now, action, keyCode);
     }
 
     @Override