server: Go 服务器（REST+WSS 网关+JWT+Argon2+配对+素材直链+任务状态机）；修复并发下线 send-on-closed-channel、下发查询 SQL 优先级、配对码原子占用、上传体积上限、JWT 默认密钥告警

server/internal/task/state_test.go

@@ -0,0 +1,82 @@
+package task
+
+import "testing"
+
+func TestHappyPath(t *testing.T) {
+	path := []struct {
+		action Action
+		want   string
+	}{
+		{ActionSubmit, PendingReview},
+		{ActionApprove, Queued},
+		{ActionDispatch, Dispatched},
+		{ActionStart, Running},
+		{ActionSuccess, Success},
+	}
+	cur := Draft
+	for _, step := range path {
+		next, ok := Next(cur, step.action)
+		if !ok || next != step.want {
+			t.Fatalf("step %s from %s: got %s ok=%v, want %s", step.action, cur, next, ok, step.want)
+		}
+		cur = next
+	}
+}
+
+func TestFailureRetry(t *testing.T) {
+	cur, ok := Next(Draft, ActionSubmit)
+	if !ok {
+		t.Fatal("submit failed")
+	}
+	cur, ok = Next(cur, ActionApprove)
+	if !ok {
+		t.Fatal("approve failed")
+	}
+	cur, ok = Next(cur, ActionDispatch)
+	if !ok {
+		t.Fatal("dispatch failed")
+	}
+	cur, ok = Next(cur, ActionStart)
+	if !ok {
+		t.Fatal("start failed")
+	}
+	cur, ok = Next(cur, ActionFail)
+	if !ok || cur != Failed {
+		t.Fatalf("fail: got %s ok=%v", cur, ok)
+	}
+	cur, ok = Next(cur, ActionRetry)
+	if !ok || cur != Queued {
+		t.Fatalf("retry: got %s ok=%v", cur, ok)
+	}
+}
+
+func TestSuspendResume(t *testing.T) {
+	cur, _ := Next(Running, ActionSuspend)
+	if cur != Suspended {
+		t.Fatalf("suspend: got %s", cur)
+	}
+	cur, ok := Next(cur, ActionResume)
+	if !ok || cur != Queued {
+		t.Fatalf("resume: got %s ok=%v", cur, ok)
+	}
+}
+
+func TestIllegalTransitions(t *testing.T) {
+	cases := []struct {
+		cur    string
+		action Action
+	}{
+		{Draft, ActionApprove},
+		{PendingReview, ActionStart},
+		{Queued, ActionSuccess},
+		{Success, ActionRetry},
+		{Cancelled, ActionResubmit},
+		{Running, ActionApprove},
+		{Dispatched, ActionSuspend},
+	}
+	for _, c := range cases {
+		if _, ok := Next(c.cur, c.action); ok {
+			t.Fatalf("illegal transition should fail: %s -> %s", c.cur, c.action)
+		}
+	}
+}