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/scenario/EditStepPage.tsx

@@ -2,12 +2,10 @@ import { useEffect, useState } from 'react';
 import { useNavigate, useParams } from 'react-router-dom';
 import { useTranslation } from 'react-i18next';
 import { scenarios, steps } from '../../api';
-import type { Scenario, ScenarioStep, StepType } from '../../api';
-import { Breadcrumbs, Button, Card, Input, Select, CodeEditor } from '../../ui';
+import type { Scenario, ScenarioStep } from '../../api';
+import { Breadcrumbs, Button, Card, Input, CodeEditor } from '../../ui';
 import styles from '../Page.module.css';
 
-const STEP_TYPES: StepType[] = ['login', 'exec', 'sign'];
-
 export function EditStepPage() {
   const { t } = useTranslation();
   const { id, stepId } = useParams<{ id: string; stepId: string }>();
@@ -17,7 +15,6 @@ export function EditStepPage() {
   const [step, setStep] = useState<ScenarioStep | null>(null);
   const [order, setOrder] = useState('');
   const [title, setTitle] = useState('');
-  const [type, setType] = useState<StepType>('exec');
   const [execCode, setExecCode] = useState('');
   const [validateCode, setValidateCode] = useState('');
   const [orderError, setOrderError] = useState('');
@@ -33,7 +30,6 @@ export function EditStepPage() {
         setStep(st);
         setOrder(String(st.order));
         setTitle(st.title ?? '');
-        setType(st.type);
         setExecCode(st.execCode ?? '');
         setValidateCode(st.validateCode ?? '');
       })
@@ -59,7 +55,6 @@ export function EditStepPage() {
       await steps.update(id!, stepId!, {
         order: Number(order),
         title: title.trim() || undefined,
-        type,
         execCode: execCode.trim() || undefined,
         validateCode: validateCode.trim() || undefined,
       });
@@ -110,27 +105,13 @@ export function EditStepPage() {
                 value={title}
                 onChange={(e) => setTitle(e.target.value)}
               />
-              <Select
-                label={t('steps.form_type')}
-                value={type}
-                onChange={(e) => setType(e.target.value as StepType)}
-                options={STEP_TYPES.map((v) => ({ value: v, label: v }))}
-              />
               <div className={styles.formField}>
                 <label className={styles.fieldLabel}>{t('steps.form_exec_code')}</label>
-                <CodeEditor
-                  value={execCode}
-                  onChange={setExecCode}
-                  rows={6}
-                />
+                <CodeEditor value={execCode} onChange={setExecCode} rows={6} />
               </div>
               <div className={styles.formField}>
                 <label className={styles.fieldLabel}>{t('steps.form_validate_code')}</label>
-                <CodeEditor
-                  value={validateCode}
-                  onChange={setValidateCode}
-                  rows={6}
-                />
+                <CodeEditor value={validateCode} onChange={setValidateCode} rows={6} />
               </div>
             </div>