fix(pages): 收紧部署包与 Agent 同步边界

完成 V2 Phase 0 安全与一致性前置：统一真实归档限额、流式拉取、候选裁剪、保留上传删除语义及 Pages 路由引用锁。

pkg/protocol/agent.go

@@ -1,3 +1,6 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
 // Package protocol defines the communication protocol between OpenFlare server, agent, and relay components.
 package protocol
 
@@ -218,4 +221,7 @@ type PagesProjectLatestHashResponse struct {
 	ProjectID    uint   `json:"project_id"`
 	DeploymentID uint   `json:"deployment_id"`
 	Hash         string `json:"hash"`
+	PackageSize  int64  `json:"package_size"`
+	FileCount    int    `json:"file_count"`
+	TotalSize    int64  `json:"total_size"`
 }

pkg/protocol/agent_test.go

@@ -1,3 +1,6 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
 package protocol
 
 import (
@@ -47,6 +50,18 @@ func TestAgentProtocolJSONTags(t *testing.T) {
 				"AccessToken": "agent_token",
 			},
 		},
+		{
+			name:  "PagesProjectLatestHashResponse",
+			value: PagesProjectLatestHashResponse{},
+			expected: map[string]string{
+				"ProjectID":    "project_id",
+				"DeploymentID": "deployment_id",
+				"Hash":         "hash",
+				"PackageSize":  "package_size",
+				"FileCount":    "file_count",
+				"TotalSize":    "total_size",
+			},
+		},
 	}
 
 	for _, tc := range cases {