[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/server/http/handlers/agentnetwork/consumption_handler.go

@@ -0,0 +1,53 @@
+package agentnetwork
+
+import (
+	"net/http"
+
+	"github.com/gorilla/mux"
+
+	"github.com/netbirdio/netbird/management/server/agentnetwork/types"
+	nbcontext "github.com/netbirdio/netbird/management/server/context"
+	"github.com/netbirdio/netbird/shared/management/http/api"
+	"github.com/netbirdio/netbird/shared/management/http/util"
+)
+
+// addConsumptionEndpoints registers the read-only Agent Network
+// consumption listing — backs the dashboard's basic counter view.
+func (h *handler) addConsumptionEndpoints(router *mux.Router) {
+	router.HandleFunc("/agent-network/consumption", h.listConsumption).Methods("GET", "OPTIONS")
+}
+
+func (h *handler) listConsumption(w http.ResponseWriter, r *http.Request) {
+	userAuth, err := nbcontext.GetUserAuthFromContext(r.Context())
+	if err != nil {
+		util.WriteError(r.Context(), err, w)
+		return
+	}
+
+	rows, err := h.manager.ListConsumption(r.Context(), userAuth.AccountId, userAuth.UserId)
+	if err != nil {
+		util.WriteError(r.Context(), err, w)
+		return
+	}
+
+	out := make([]api.AgentNetworkConsumption, 0, len(rows))
+	for _, row := range rows {
+		out = append(out, consumptionToAPI(row))
+	}
+	util.WriteJSONObject(r.Context(), w, out)
+}
+
+func consumptionToAPI(c *types.Consumption) api.AgentNetworkConsumption {
+	windowStart := c.WindowStartUTC
+	updatedAt := c.UpdatedAt
+	return api.AgentNetworkConsumption{
+		DimensionKind:  api.AgentNetworkConsumptionDimensionKind(c.DimensionKind),
+		DimensionId:    c.DimensionID,
+		WindowSeconds:  c.WindowSeconds,
+		WindowStartUtc: windowStart,
+		TokensInput:    c.TokensInput,
+		TokensOutput:   c.TokensOutput,
+		CostUsd:        c.CostUSD,
+		UpdatedAt:      &updatedAt,
+	}
+}