diff --git a/web/src/components/admin/console/sections/EnvSettingsSection.tsx b/web/src/components/admin/console/sections/EnvSettingsSection.tsx
index e337ec7a..94f4ca1a 100644
--- a/web/src/components/admin/console/sections/EnvSettingsSection.tsx
+++ b/web/src/components/admin/console/sections/EnvSettingsSection.tsx
@@ -181,13 +181,19 @@ export const EnvSettingsSection: React.FC = () => {
                     {s.secret && !s.hasValue ? ' · 未配置' : ''}
                   </div>
                 </div>
-                <div style={{ display: 'flex', alignItems: 'center', gap: '10px', flexShrink: 0 }}>
+                <form
+                  onSubmit={(e) => {
+                    e.preventDefault();
+                    if (canSave && savingKey !== s.key) void handleSave(s);
+                  }}
+                  style={{ display: 'flex', alignItems: 'center', gap: '10px', flexShrink: 0 }}
+                >
                   <input
                     type={s.secret ? 'password' : 'text'}
                     value={String(draft ?? '')}
                     placeholder={s.secret ? (s.hasValue ? '留空保持原值 / 填写新值' : '填写密钥') : undefined}
                     disabled={!s.writable}
-                    autoComplete="off"
+                    autoComplete={s.secret ? 'new-password' : 'off'}
                     onChange={(e) => setDrafts((prev) => ({ ...prev, [s.key]: e.target.value }))}
                     style={{
                       width: '260px',
@@ -202,9 +208,8 @@ export const EnvSettingsSection: React.FC = () => {
                   />
                   {s.writable && (
                     <button
-                      type="button"
+                      type="submit"
                       disabled={!canSave || savingKey === s.key}
-                      onClick={() => void handleSave(s)}
                       style={{
                         padding: '6px 16px',
                         borderRadius: '6px',
@@ -219,7 +224,7 @@ export const EnvSettingsSection: React.FC = () => {
                       {savingKey === s.key ? '保存中…' : '保存'}
                     </button>
                   )}
-                </div>
+                </form>
               </div>
             );
           })}
diff --git a/web/src/components/project/ProjectSettingsModal.tsx b/web/src/components/project/ProjectSettingsModal.tsx
index d2786e92..965f78b9 100644
--- a/web/src/components/project/ProjectSettingsModal.tsx
+++ b/web/src/components/project/ProjectSettingsModal.tsx
@@ -33,7 +33,9 @@ import {
   clientDutyIssues,
   formatDutyIssues,
   locateDutyIssue,
+  needsGovernedDocument,
   needsThreeMembersForDuties,
+  NO_GOVERNED_DOCUMENT_MESSAGE,
   resolveClientDocTaskDuty,
   toggleAuthorOnly,
   toggleHumanApproval,
@@ -226,6 +228,10 @@ export const ProjectSettingsModal: React.FC<ProjectSettingsModalProps> = ({
       setError(`当前项目只有 ${members.length} 名有效成员。纳入人工审批的文档需要分别指定编制、审核、批准负责人。`);
       return;
     }
+    if (!liveEdit && !needsGovernedDocument(plan)) {
+      setError(NO_GOVERNED_DOCUMENT_MESSAGE);
+      return;
+    }
 
     setLoading(true);
     setError(null);
@@ -641,6 +647,20 @@ export const ProjectSettingsModal: React.FC<ProjectSettingsModalProps> = ({
               <p style={{ fontSize: '13px', color: 'var(--text-muted)', margin: 0 }}>
                 允许裁剪的文档可选择是否纳入人工审批。关闭后仍会生成并进入版本账本，只是不走三权。
               </p>
+              {!liveEdit && !needsGovernedDocument(plan) && (
+                <div
+                  style={{
+                    padding: '10px 12px',
+                    background: 'var(--warning-50, #fffbeb)',
+                    border: '1px solid var(--warning-200, #fde68a)',
+                    borderRadius: '8px',
+                    color: 'var(--warning-800, #92400e)',
+                    fontSize: '12px',
+                  }}
+                >
+                  {NO_GOVERNED_DOCUMENT_MESSAGE}。请勾选「纳入人工审批」并指定负责人；成员不足三人时可用「由编制人兼任审核、批准」。
+                </div>
+              )}
               {needsThreeMembersForDuties(plan, requireApprovalKeys) && members.length < 3 && (
                 <div
                   style={{
diff --git a/web/src/lib/projectSettingsDuties.test.ts b/web/src/lib/projectSettingsDuties.test.ts
index b902a82d..5c747e27 100644
--- a/web/src/lib/projectSettingsDuties.test.ts
+++ b/web/src/lib/projectSettingsDuties.test.ts
@@ -6,6 +6,7 @@ import {
   classifyClientDuty,
   clientDutyIssues,
   locateDutyIssue,
+  needsGovernedDocument,
   needsThreeMembersForDuties,
   resolveClientDocTaskDuty,
   toggleAuthorOnly,
@@ -67,6 +68,36 @@ describe('projectSettingsDuties', () => {
     assert.equal(locateDutyIssue(switchedOn, 'research')?.code, 'DUTY_ASSIGNMENT_REQUIRED');
   });
 
+  it('blocks activation preview when no document is under human approval', () => {
+    const unmanaged = plan([
+      { task_key: 'research', enabled: true, approval_configurable: true, duties: {} },
+      { task_key: 'quote', enabled: true, approval_configurable: true, duties: {} },
+    ]);
+    assert.equal(needsGovernedDocument(unmanaged), false);
+    assert.deepEqual(clientDutyIssues(unmanaged, [{ userId: 1 }]), []);
+
+    const authorOnly = plan([
+      {
+        task_key: 'intake',
+        enabled: true,
+        approval_configurable: true,
+        duty_policy: 'author_only',
+        duties: { author_user_id: 7 },
+      },
+    ]);
+    assert.equal(needsGovernedDocument(authorOnly), true);
+
+    const separated = plan([
+      {
+        task_key: 'intake',
+        enabled: true,
+        approval_configurable: true,
+        duties: { author_user_id: 1, reviewer_user_id: 2, approver_user_id: 3 },
+      },
+    ]);
+    assert.equal(needsGovernedDocument(separated), true);
+  });
+
   it('allows an all-none configurable draft without three members', () => {
     const draft = plan([
       { task_key: 'research', enabled: true, approval_configurable: true, duties: {} },
diff --git a/web/src/lib/projectSettingsDuties.ts b/web/src/lib/projectSettingsDuties.ts
index a6c08abd..0baf14ff 100644
--- a/web/src/lib/projectSettingsDuties.ts
+++ b/web/src/lib/projectSettingsDuties.ts
@@ -189,6 +189,17 @@ export function clientDutyIssues(
   return issues;
 }
 
+/** 对齐服务端 validateActivationPlan：激活前至少一份文档为完整人工审批（含兼任派生的 A/A/A）。 */
+export const NO_GOVERNED_DOCUMENT_MESSAGE = '至少一份文档必须纳入人工审批才能激活工作流';
+
+export function needsGovernedDocument(plan: WorkflowPlan): boolean {
+  return plan.stages.some(
+    (stage) =>
+      stage.enabled &&
+      stage.doc_tasks.some((task) => task.enabled && resolveClientDocTaskDuty(task).mode === 'full'),
+  );
+}
+
 export function needsThreeMembersForDuties(plan: WorkflowPlan, requireApprovalKeys: string[] = []): boolean {
   return plan.stages.some(
     (stage) =>