fix(apiserver): validate named and array submissions like any other (bug-1953)

preCheckJobRequest() returned from inside its job-name branch, so every
named or array job skipped the description, project and resreq checks,
resreq validation and the shell-limit conversion that follow. The name now
only sets the job count and array flag, and every submission runs the rest.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/frontend/apiserver/controllers/jobs_test.go

@@ -270,3 +270,36 @@ func TestPreCheckJobRequest_RejectsMalformedResreq(t *testing.T) {
 		t.Fatalf("malformed resreq must be rejected, got err=%v", err)
 	}
 }
+
+// bug-1953: a job name (plain or array) must not skip the checks and
+// conversions every other submission gets.
+func TestPreCheckJobRequest_NamedJobsGetFullValidation(t *testing.T) {
+	resetJobSubmitState()
+	origCfg := utils.JobYamlConfig
+	utils.JobYamlConfig = &utils.JobConfig{MaxArraySize: 1000}
+	t.Cleanup(func() { utils.JobYamlConfig = origCfg })
+
+	for _, name := range []string{"", "myjob", "arr[1-3]"} {
+		req := &models.JobSubmitRequest{JobName: name, Command: "sleep 1"}
+		req.ShellLimit.CPULimit = 60000
+		n, isArray, err := preCheckJobRequest(req)
+		if err != nil {
+			t.Fatalf("name %q: unexpected error %v", name, err)
+		}
+		if req.CPULimit.Seconds != 60 {
+			t.Errorf("name %q: cpu limit not converted: got %d s, want 60", name, req.CPULimit.Seconds)
+		}
+		if name == "arr[1-3]" && (n != 3 || !isArray || req.JobName != "arr") {
+			t.Errorf("array name: got n=%d isArray=%v name=%q, want 3 true \"arr\"", n, isArray, req.JobName)
+		}
+		if name == "myjob" && (n != 1 || isArray) {
+			t.Errorf("plain name: got n=%d isArray=%v, want 1 false", n, isArray)
+		}
+
+		bad := &models.JobSubmitRequest{JobName: name, Command: "sleep 1",
+			ProjectName: strings.Repeat("p", 512)}
+		if _, _, err := preCheckJobRequest(bad); err == nil {
+			t.Errorf("name %q: an over-long project name was accepted", name)
+		}
+	}
+}