refactor(scenario): remove step type and simplify scheduler to exec-only

- remove StepType, type column, and type field from step entity and DTOs
- remove executeLoginStep, executeSignStep, executeExecStep from scheduler
- inline exec logic directly in executeStepRun; all steps run execCode
- remove AuthService, EnvironmentService, runEnvironments from scheduler
- remove type selector from CreateStepPage and EditStepPage
- remove type badge column from ScenarioDetailPage
- fix useEffect dependency arrays in RunDetailPage (FINAL, id, runId, polling)
- fix duplicate /snippets proxy key in vite.config.ts
- remove unused escapeHtml export from hljs.ts

client/src/pages/run/RunDetailPage.tsx

@@ -58,6 +58,8 @@ const LOG_LEVEL_VARIANT: Record<LogLevel, BadgeVariant> = {
   error: 'error',
 };
 
+const FINAL: ScenarioRunStatus[] = ['pass', 'fail'];
+
 export function RunDetailPage() {
   const { t } = useTranslation();
   const { id, runId } = useParams<{ id: string; runId: string }>();
@@ -76,8 +78,6 @@ export function RunDetailPage() {
   const LOG_PAGE_SIZE = 25;
   const pollRef = useRef<ReturnType<typeof setInterval> | null>(null);
 
-  const FINAL: ScenarioRunStatus[] = ['pass', 'fail'];
-
   const stopPolling = () => {
     if (pollRef.current) {
       clearInterval(pollRef.current);
@@ -97,8 +97,11 @@ export function RunDetailPage() {
 
   useEffect(() => {
     if (!id || !runId || polling) return;
-    runs.get(id, runId, debouncedSearch).then(setRun).catch(() => undefined);
-  }, [debouncedSearch]);
+    runs
+      .get(id, runId, debouncedSearch)
+      .then(setRun)
+      .catch(() => undefined);
+  }, [id, runId, polling, debouncedSearch]);
 
   useEffect(() => {
     if (!id || !runId) return;
@@ -124,8 +127,12 @@ export function RunDetailPage() {
           }, 1000);
         }
       })
-      .catch((err: Error) => { if (!cancelled) setError(err.message); })
-      .finally(() => { if (!cancelled) setLoading(false); });
+      .catch((err: Error) => {
+        if (!cancelled) setError(err.message);
+      })
+      .finally(() => {
+        if (!cancelled) setLoading(false);
+      });
 
     return () => {
       cancelled = true;