[agent-network] Management: store, manager, synthesizer, policy engine, provider catalog, HTTP/gRPC API

Adds the account-scoped agent-network module: provider/policy/budget CRUD and
store, the reverse-proxy service synthesizer, policy selection + limit
enforcement, the provider catalog (incl. Vertex AI and AWS Bedrock entries),
and the management HTTP + proxy gRPC surfaces.

management/internals/modules/reverseproxy/accesslogs/accesslogentry.go

@@ -39,6 +39,10 @@ type AccessLogEntry struct {
 	BytesDownload   int64             `gorm:"index"`
 	Protocol        AccessLogProtocol `gorm:"index"`
 	Metadata        map[string]string `gorm:"serializer:json"`
+	// AgentNetwork marks the entry as emitted by a synthesised agent-network
+	// service. Sourced from proto.AccessLog.AgentNetwork the proxy stamps
+	// before shipping. Indexed so the agent-network log surface filters cheaply.
+	AgentNetwork bool `gorm:"index"`
 }
 
 // FromProto creates an AccessLogEntry from a proto.AccessLog
@@ -58,6 +62,7 @@ func (a *AccessLogEntry) FromProto(serviceLog *proto.AccessLog) {
 	a.BytesDownload = serviceLog.GetBytesDownload()
 	a.Protocol = AccessLogProtocol(serviceLog.GetProtocol())
 	a.Metadata = maps.Clone(serviceLog.GetMetadata())
+	a.AgentNetwork = serviceLog.GetAgentNetwork()
 
 	if sourceIP := serviceLog.GetSourceIp(); sourceIP != "" {
 		if addr, err := netip.ParseAddr(sourceIP); err == nil {