chore: 统一本地服务器与远程仓库源码

- 合并 main 与 master 历史并以服务器结构为基线
- 保留迁移、数据保留、AWS 账单与部署安全能力
- 建立 SDD 规格和 CI 验证闭环

backend/middleware/agent_auth.go

@@ -0,0 +1,54 @@
+package middleware
+
+import (
+	"net/http"
+	"strings"
+
+	"ezops/model"
+	"ezops/pkg/agentauth"
+
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+)
+
+const agentCredentialContextKey = "agentCredential"
+
+// AgentAuth 在兼容阶段识别新 Token，强制阶段拒绝旧的匿名和用户 JWT 调用。 // Logan.Li
+func AgentAuth(db *gorm.DB, enforce bool) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		authHeader := c.GetHeader("Authorization")
+		if authHeader == "" {
+			if enforce {
+				c.AbortWithStatusJSON(http.StatusUnauthorized, model.Response{Code: 401, Message: "未提供 Agent 凭证"})
+			}
+			return
+		}
+		parts := strings.SplitN(authHeader, " ", 2)
+		if len(parts) == 2 && parts[0] == "Bearer" && strings.HasPrefix(parts[1], "agt_") {
+			credential, err := agentauth.Authenticate(db, parts[1])
+			if err == nil {
+				c.Set(agentCredentialContextKey, credential)
+				return
+			}
+			c.AbortWithStatusJSON(http.StatusUnauthorized, model.Response{Code: 401, Message: "无效 Agent 凭证"})
+			return
+		}
+		if enforce {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, model.Response{Code: 401, Message: "无效 Agent 凭证"})
+		}
+	}
+}
+
+// RequireAgentHostname 校验请求中主机名与凭证绑定主机一致。 // Logan.Li
+func RequireAgentHostname(c *gin.Context, hostname string) bool {
+	credential, exists := c.Get(agentCredentialContextKey)
+	if !exists {
+		return true
+	}
+	agentCredential, ok := credential.(*model.AgentCredential)
+	if !ok || agentCredential.Hostname != hostname {
+		c.AbortWithStatusJSON(http.StatusForbidden, model.Response{Code: 403, Message: "Agent 凭证与主机不匹配"})
+		return false
+	}
+	return true
+}