feat(rdp): 新增 RDP 远程桌面/SMB/账单同步能力 + 清理编译产物

主要变更：
- RDP 远程桌面：新增 backend/pkg/rdp（RDP 引擎 + credssp/display/rle/trace）、
  backend/controller/rdp*（连接/凭证/文件/会话/实时）、frontend RDP 组件与 API
- Windows SMB 文件传输：backend/pkg/winsmb
- 云账单同步：backend/pkg/billingsync + billing_sync/aliyun_billing，前端账单详情
- Agent CLI Kubernetes 工具：kubernetes_action/get、pod_execute/logs
- 服务器导入助手：server_import_helpers、ImportCredentialSettings
- 国际化与组件重构（cloud/deploy/monitor/server/system 等多模块）
- 清理编译产物二进制：移除 backend/server、backend/agent/bin/aiops-agent-*
- .gitignore：新增 backend/agent/ 与 .cache/（避免 334MB go-build 缓存误入库）

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

backend/pkg/rdp/input_fastpath.go

@@ -0,0 +1,161 @@
+package rdp
+
+import (
+	"io"
+	"sync"
+	"time"
+	"unicode/utf16"
+)
+
+const (
+	fastPathInputEventScancode = 0
+	fastPathInputEventMouse    = 1
+	fastPathInputEventUnicode  = 4
+
+	fastPathInputKBRelease   = 0x01
+	fastPathInputKBExtended  = 0x02
+	fastPathInputKBExtended1 = 0x04
+
+	ptrFlagsMove  = 0x0800
+	ptrFlagsDown  = 0x8000
+	ptrFlagsBtn1  = 0x1000
+	ptrFlagsBtn2  = 0x2000
+	ptrFlagsBtn3  = 0x4000
+	ptrFlagsWheel = 0x0200
+)
+
+// InputSender 通过 Fast-Path Input 向远端发送键鼠事件 // Logan.Li
+type InputSender struct {
+	w  io.Writer
+	mu *sync.Mutex
+}
+
+func NewInputSender(w io.Writer) *InputSender {
+	return &InputSender{w: w}
+}
+
+func NewInputSenderWithLock(w io.Writer, mu *sync.Mutex) *InputSender {
+	return &InputSender{w: w, mu: mu}
+}
+
+func (s *InputSender) Send(events []byte) error {
+	if s.mu != nil {
+		s.mu.Lock()
+		defer s.mu.Unlock()
+	}
+	return WriteFastPathInput(s.w, events)
+}
+
+func (s *InputSender) Key(scancode int, down bool) error {
+	flags := byte(0)
+	if !down {
+		flags |= fastPathInputKBRelease
+	}
+	code := uint16(scancode)
+	if scancode&0xFF00 == 0xE000 {
+		flags |= fastPathInputKBExtended
+		code = uint16(scancode & 0xFF)
+	}
+	buf := []byte{byte(fastPathInputEventScancode<<5) | flags}
+	buf = append(buf, byte(code))
+	return s.Send(buf)
+}
+
+func (s *InputSender) MouseMove(x, y int) error {
+	return s.mouseEvent(ptrFlagsMove, x, y)
+}
+
+func (s *InputSender) MouseButton(x, y, button int, down bool) error {
+	flags := ptrFlagsDown
+	// 浏览器 MouseEvent.button 使用 0/1/2 表示左/中/右键，RDP BTN2 才是右键。 // Logan.Li
+	switch button {
+	case 2:
+		flags |= ptrFlagsBtn2
+	case 1:
+		flags |= ptrFlagsBtn3
+	default:
+		flags |= ptrFlagsBtn1
+	}
+	if !down {
+		flags &^= ptrFlagsDown
+	}
+	return s.mouseEvent(flags, x, y)
+}
+
+func (s *InputSender) MouseWheel(x, y, deltaY int) error {
+	scroll := -deltaY * 120 / 100
+	if scroll == 0 && deltaY != 0 {
+		if deltaY > 0 {
+			scroll = -120
+		} else {
+			scroll = 120
+		}
+	}
+	flags := uint16(ptrFlagsWheel | 0x0001)
+	if scroll < 0 {
+		flags |= 0x0100
+		scroll = -scroll
+	}
+	buf := []byte{byte(fastPathInputEventMouse << 5)}
+	buf = append(buf, byte(flags), byte(flags>>8))
+	buf = append(buf, byte(x), byte(x>>8), byte(y), byte(y>>8))
+	buf = append(buf, byte(scroll), byte(scroll>>8))
+	return s.Send(buf)
+}
+
+func (s *InputSender) mouseEvent(flags int, x, y int) error {
+	buf := []byte{byte(fastPathInputEventMouse << 5)}
+	buf = append(buf, byte(flags), byte(flags>>8))
+	buf = append(buf, byte(x), byte(x>>8), byte(y), byte(y>>8))
+	return s.Send(buf)
+}
+
+func (s *InputSender) TypeText(text string) error {
+	for _, r := range utf16.Encode([]rune(text)) {
+		if err := s.unicodeKey(uint16(r), true); err != nil {
+			return err
+		}
+		if err := s.unicodeKey(uint16(r), false); err != nil {
+			return err
+		}
+		time.Sleep(5 * time.Millisecond)
+	}
+	return nil
+}
+
+func (s *InputSender) unicodeKey(code uint16, down bool) error {
+	flags := byte(0)
+	if !down {
+		flags |= fastPathInputKBRelease
+	}
+	buf := []byte{byte(fastPathInputEventUnicode<<5) | flags, byte(code), byte(code >> 8)}
+	return s.Send(buf)
+}
+
+func (s *InputSender) AutoExec(command string) error {
+	if err := s.Key(0xE05B, true); err != nil {
+		return err
+	}
+	if err := s.Key(0xE05B, false); err != nil {
+		return err
+	}
+	time.Sleep(80 * time.Millisecond)
+	if err := s.Key(0xE05B, true); err != nil {
+		return err
+	}
+	if err := s.Key(0x0015, true); err != nil {
+		return err
+	}
+	if err := s.Key(0x0015, false); err != nil {
+		return err
+	}
+	if err := s.Key(0xE05B, false); err != nil {
+		return err
+	}
+	time.Sleep(200 * time.Millisecond)
+	if err := s.TypeText(command); err != nil {
+		return err
+	}
+	time.Sleep(80 * time.Millisecond)
+	return s.Key(0x001C, true)
+}