style: drop the line comments added with the triage fixes

CLAUDE.md rules out // line comments in committed Go. The rationale they
carried is in the commit messages for each fix; doc comments that already
existed are kept, updated where the code they describe changed.

Also replaces reflect.Ptr with reflect.Pointer and rewrites the YAML keyword
alternation as a lookup table, both flagged by golangci-lint.

internal/web/job/xray_traffic_inform_test.go

@@ -10,9 +10,6 @@ import (
 	"github.com/valyala/fasthttp"
 )
 
-// stallingListener accepts connections, reads whatever is sent and then never
-// answers and never closes — the receiver shape that used to hold the traffic
-// job open indefinitely (#6115).
 func stallingListener(t *testing.T) (addr string, release func()) {
 	t.Helper()
 	ln, err := net.Listen("tcp", "127.0.0.1:0")
@@ -65,7 +62,6 @@ func TestExternalInformClient_StalledReceiverTimesOut(t *testing.T) {
 	if !errors.Is(err, fasthttp.ErrTimeout) {
 		t.Errorf("want a timeout error, got %v", err)
 	}
-	// The whole point is that the call cannot outlast the 5s poll cadence.
 	if elapsed > externalInformTimeout+2*time.Second {
 		t.Errorf("call took %v, must be bounded by %v", elapsed, externalInformTimeout)
 	}
@@ -80,8 +76,6 @@ func TestExternalInformClient_HasDeadlines(t *testing.T) {
 	}
 }
 
-// An idle panel posts nothing, which keeps a misbehaving receiver out of the
-// job's path entirely for most ticks.
 func TestInformSkippedWhenNothingToReport(t *testing.T) {
 	j := &XrayTrafficJob{}
 	done := make(chan struct{})

internal/web/job/xray_traffic_job.go

@@ -29,19 +29,8 @@ type XrayTrafficJob struct {
 // refetch for the rest.
 const clientStatsSnapshotMaxClients = 5000
 
-// externalInformTimeout bounds the traffic-notify POST. Run() is scheduled
-// every 5s under cron.SkipIfStillRunning, so an unbounded call to a receiver
-// that accepts the connection and then stalls does not merely delay one
-// notification: it holds the job, and every following tick is skipped for as
-// long as the stall lasts. AddTraffic — quota enforcement, auto-renew — and
-// the online/websocket work all sit in that same tick (#6115).
 const externalInformTimeout = 3 * time.Second
 
-// externalInformClient is kept separate from fasthttp's shared default client
-// so this endpoint's timeouts and connection handling cannot be influenced by,
-// or influence, any other caller. Idempotent-call retries stay off on purpose:
-// the payload carries per-tick deltas, so an attempt that reached the receiver
-// but failed on the response leg would be counted twice if it were resent.
 var externalInformClient = &fasthttp.Client{
 	ReadTimeout:         externalInformTimeout,
 	WriteTimeout:        externalInformTimeout,