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/mppc.go

@@ -0,0 +1,125 @@
+package rdp
+
+// MPPC 解压器实现 RDP 64K 字典压缩（MS-RDPBCGR §3.1.8.4.1）// Logan.Li
+
+const mppcHistorySize = 65536
+
+const (
+	mppcBig        = 0x01
+	mppcCompressed = 0x20
+	mppcReset      = 0x40
+	mppcFlushed    = 0x80
+)
+
+// MppcDecompressor 维护单连接 MPPC 历史窗口 // Logan.Li
+type MppcDecompressor struct {
+	history [mppcHistorySize]byte
+	offset  int
+}
+
+func NewMppcDecompressor() *MppcDecompressor {
+	return &MppcDecompressor{}
+}
+
+func (d *MppcDecompressor) Decompress(flags byte, data []byte) ([]byte, error) {
+	if flags&mppcFlushed != 0 {
+		d.history = [mppcHistorySize]byte{}
+		d.offset = 0
+	} else if flags&mppcReset != 0 {
+		d.offset = 0
+	}
+	if flags&mppcCompressed == 0 {
+		for _, b := range data {
+			d.history[d.offset] = b
+			d.offset = (d.offset + 1) & (mppcHistorySize - 1)
+		}
+		return data, nil
+	}
+	output := make([]byte, 0, len(data)*3)
+	br := newMppcBitReader(data)
+outer:
+	for br.bitsLeft >= 9 {
+		if br.readBit() == 0 {
+			b := byte(br.readBits(8))
+			output = append(output, b)
+			d.history[d.offset] = b
+			d.offset = (d.offset + 1) & (mppcHistorySize - 1)
+		} else {
+			sel := (br.readBit() << 1) | br.readBit()
+			var copyOffset int
+			switch sel {
+			case 0:
+				if br.bitsLeft < 6 {
+					break outer
+				}
+				copyOffset = br.readBits(6)
+			case 1:
+				if br.bitsLeft < 8 {
+					break outer
+				}
+				copyOffset = 64 + br.readBits(8)
+			case 2:
+				if br.bitsLeft < 13 {
+					break outer
+				}
+				copyOffset = 320 + br.readBits(13)
+			case 3:
+				if br.bitsLeft < 16 {
+					break outer
+				}
+				copyOffset = 8192 + br.readBits(16)
+			}
+			copyLength := 3
+			for br.bitsLeft > 0 {
+				if br.readBit() == 0 {
+					break
+				}
+				copyLength++
+			}
+			src := (d.offset - copyOffset - 1 + mppcHistorySize) & (mppcHistorySize - 1)
+			for i := 0; i < copyLength; i++ {
+				b := d.history[(src+i)&(mppcHistorySize-1)]
+				output = append(output, b)
+				d.history[d.offset] = b
+				d.offset = (d.offset + 1) & (mppcHistorySize - 1)
+			}
+		}
+	}
+	return output, nil
+}
+
+type mppcBitReader struct {
+	data     []byte
+	byteIdx  int
+	mask     byte
+	bitsLeft int
+}
+
+func newMppcBitReader(data []byte) *mppcBitReader {
+	return &mppcBitReader{data: data, mask: 0x80, bitsLeft: len(data) * 8}
+}
+
+func (r *mppcBitReader) readBit() int {
+	if r.bitsLeft == 0 {
+		return 0
+	}
+	r.bitsLeft--
+	bit := 0
+	if r.data[r.byteIdx]&r.mask != 0 {
+		bit = 1
+	}
+	r.mask >>= 1
+	if r.mask == 0 {
+		r.mask = 0x80
+		r.byteIdx++
+	}
+	return bit
+}
+
+func (r *mppcBitReader) readBits(n int) int {
+	result := 0
+	for i := 0; i < n; i++ {
+		result = (result << 1) | r.readBit()
+	}
+	return result
+}