feat(api): add namespaces, batch ops, and admin logs

internal/model/namespace.go

@@ -0,0 +1,11 @@
+package model
+
+import "gorm.io/gorm"
+
+// Namespace represents a logical namespace for public models/bindings.
+type Namespace struct {
+	gorm.Model
+	Name        string `gorm:"size:100;uniqueIndex;not null" json:"name"`
+	Status      string `gorm:"size:50;default:'active'" json:"status"`
+	Description string `gorm:"size:255" json:"description"`
+}

internal/model/operation_log.go

@@ -0,0 +1,18 @@
+package model
+
+import "gorm.io/gorm"
+
+// OperationLog stores admin actions for audit.
+type OperationLog struct {
+	gorm.Model
+	Actor        string `gorm:"size:100" json:"actor"`
+	Method       string `gorm:"size:10" json:"method"`
+	Path         string `gorm:"size:255" json:"path"`
+	Query        string `gorm:"size:2048" json:"query"`
+	StatusCode   int    `json:"status_code"`
+	LatencyMs    int64  `json:"latency_ms"`
+	ClientIP     string `gorm:"size:64" json:"client_ip"`
+	RequestID    string `gorm:"size:64" json:"request_id"`
+	UserAgent    string `gorm:"size:255" json:"user_agent"`
+	ErrorMessage string `gorm:"size:1024" json:"error_message"`
+}