[management] Add dashboard_features account setting (#6742)

Introduce a nullable dashboard_features object on account settings, serialized
to a single JSON column so new dashboard sections can be added without schema
changes. Starts with agent_network (show the Agent Network menu for an account
without the deployment flag). Wires the API handler mapping, the pgx GetAccount
loader, and adds store round-trip and handler tests.

shared/management/http/api/openapi.yml

@@ -379,6 +379,8 @@ components:
           description: Limits the dashboard to the Agent Network surface for this account. Set for accounts created via netbird.ai signups and can be disabled later.
           type: boolean
           example: false
+        dashboard_features:
+          $ref: '#/components/schemas/AccountDashboardFeatures'
         embedded_idp_enabled:
           description: Indicates whether the embedded identity provider (Dex) is enabled for this account. This is a read-only field.
           type: boolean
@@ -407,6 +409,14 @@ components:
         - regular_users_view_blocked
         - peer_expose_enabled
         - peer_expose_groups
+    AccountDashboardFeatures:
+      description: Per-account dashboard section visibility overrides. Omitted keys follow the default dashboard behavior.
+      type: object
+      properties:
+        agent_network:
+          description: Controls the Agent Network menu for the account regardless of the deployment feature flag. When true the menu is shown, when false it is hidden, and when omitted the default behavior applies.
+          type: boolean
+          example: true
     AccountExtraSettings:
       type: object
       properties:

shared/management/http/api/types.gen.go

@@ -1612,6 +1612,12 @@ type Account struct {
 	Settings   AccountSettings   `json:"settings"`
 }
 
+// AccountDashboardFeatures Per-account dashboard section visibility overrides. Omitted keys follow the default dashboard behavior.
+type AccountDashboardFeatures struct {
+	// AgentNetwork Controls the Agent Network menu for the account regardless of the deployment feature flag. When true the menu is shown, when false it is hidden, and when omitted the default behavior applies.
+	AgentNetwork *bool `json:"agent_network,omitempty"`
+}
+
 // AccountExtraSettings defines model for AccountExtraSettings.
 type AccountExtraSettings struct {
 	// NetworkTrafficLogsEnabled Enables or disables network traffic logging. If enabled, all network traffic events from peers will be stored.
@@ -1656,6 +1662,9 @@ type AccountSettings struct {
 	// AutoUpdateVersion Set Clients auto-update version. "latest", "disabled", or a specific version (e.g "0.50.1")
 	AutoUpdateVersion *string `json:"auto_update_version,omitempty"`
 
+	// DashboardFeatures Per-account dashboard section visibility overrides. Omitted keys follow the default dashboard behavior.
+	DashboardFeatures *AccountDashboardFeatures `json:"dashboard_features,omitempty"`
+
 	// DnsDomain Allows to define a custom dns domain for the account
 	DnsDomain *string `json:"dns_domain,omitempty"`