feat(accounts): add provider account inventory api

tests/integration/store_init_test.go

@@ -144,6 +144,7 @@ func TestStoreAppliesLatestMigration(t *testing.T) {
 		"route_decision_logs",
 		"route_failover_events",
 		"route_sticky_audit",
+		"provider_accounts",
 	} {
 		if !tableExists(t, store.SQLDB(), table) {
 			t.Fatalf("table %q does not exist after latest migration", table)
@@ -272,6 +273,23 @@ func TestStoreAppliesLatestMigration(t *testing.T) {
 			t.Fatalf("column %q missing from route_sticky_audit", column)
 		}
 	}
+
+	for _, column := range []string{
+		"host_id",
+		"provider_id",
+		"route_id",
+		"shadow_group_id",
+		"host_account_id",
+		"key_fingerprint",
+		"account_status",
+		"last_probe_status",
+		"last_probe_at",
+		"disabled_reason",
+	} {
+		if !tableColumnExists(t, store.SQLDB(), "provider_accounts", column) {
+			t.Fatalf("column %q missing from provider_accounts", column)
+		}
+	}
 }
 
 func TestStoreInitEnforcesLogicalRoutingConstraints(t *testing.T) {