feat(check): 文件要在、扫描件兜底（C10）；响应方式存进清单并可改（C12）

- check/presence.py：「提供《授权委托书》」「须提交投标函」这类要求按标题里有没有这个文件名判断，不调模型。
- 扫描件兜底：要附证明材料的要求没找到、投标文件里有扫描件页时，改为提示级「可能在扫描件里，请人工核对」。
- 响应方式解析时识别、带依据句子存进 checklist.response_modes（迁移 0008）；清单页显示、可改（写审计，
  重新解析不覆盖人工改过的）；查标用存下来的。新接口 PUT /projects/{id}/checklist/response-modes/{category}。
- check_item_result.layer 加 presence（迁移 0007）；契约同步默认接受的两种结论。

开发集 17 份：规矩投标文件的致命问题 120 → 51，致命级召回不变（22 / 32）（docs/architecture/check-eval.md §5）。

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/src/pages/ChecklistPage.vue

@@ -9,7 +9,7 @@
  */
 import { unwrap } from "@bid-doctor/api-client";
 import { FileText, Info, Plus, Search } from "@lucide/vue";
-import { useQuery } from "@tanstack/vue-query";
+import { useQuery, useQueryClient } from "@tanstack/vue-query";
 import { computed, onBeforeUnmount, onMounted, ref, watch } from "vue";
 import { RouterLink } from "vue-router";
 import ChecklistItemRow from "@/components/ChecklistItemRow.vue";
@@ -23,6 +23,7 @@ import { api, errorTitle } from "@/lib/api";
 import { useChecklistOps, useDeletedItems, type ItemFields } from "@/lib/checklistOps";
 import { groupCitations, type CitationGroup } from "@/lib/citations";
 import { useCrumbs } from "@/lib/crumbs";
+import { qk } from "@/lib/keys";
 import { category, CATEGORY_ORDER, fmtDateTime, MARKER, projectStatus } from "@/lib/labels";
 import { useChecklist, useChecklistItems, useProject, type ChecklistItem, type Citation, type MarkingRule } from "@/lib/queries";
 import { toast } from "@/lib/toast";
@@ -108,6 +109,29 @@ function openCitation(c: Citation, tail: Citation[] = []) {
   target.value = { id: c.id, page: c.page_no, quads: c.quads, sha: c.normalized_sha256, more };
 }
 const openGroup = (g: CitationGroup) => openCitation(g.head, g.tail);
+
+/* ---------- 响应方式（C12）：招标文件要求逐条响应，还是只列偏离、没列出的视为接受；查标按它判没找到响应算不算问题 ---------- */
+const qc = useQueryClient();
+const MODE_CATEGORY: Record<string, string> = { technical: "技术要求", commercial: "商务要求" };
+const MODE_STATUS: Record<string, string> = { unknown: "招标文件没写明，按逐条响应处理", conflict: "招标文件两处写法不一致，按逐条响应处理" };
+const modeBusy = ref("");
+async function setMode(category: "technical" | "commercial", mode: "explicit" | "implicit") {
+  modeBusy.value = category;
+  try {
+    await unwrap(
+      api.PUT("/projects/{project_id}/checklist/response-modes/{category}", {
+        params: { path: { project_id: props.projectId, category } },
+        body: { mode },
+      }),
+    );
+    await qc.invalidateQueries({ queryKey: qk.checklist(props.projectId) });
+    toast(`已改为「${mode === "implicit" ? "只列偏离，没列出的视为接受" : "逐条响应"}」，下次检查按这个判断`);
+  } catch (e) {
+    toast(errorTitle(e), { ok: false });
+  } finally {
+    modeBusy.value = "";
+  }
+}
 function select(i: ChecklistItem, opt: { scroll?: boolean } = {}) {
   if (picking.value && picking.value.item.id !== i.id) cancelPick();
   selId.value = i.id;
@@ -266,6 +290,26 @@ onBeforeUnmount(() => window.removeEventListener("keydown", onKey));
       </div>
     </div>
 
+    <div v-if="cl?.response_modes?.length" class="modes" aria-label="招标文件的响应方式">
+      <span class="cap muted">响应方式</span>
+      <div v-for="m in cl.response_modes" :key="m.category" class="mode">
+        <label :for="`mode-${m.category}`">{{ MODE_CATEGORY[m.category] }}</label>
+        <select
+          :id="`mode-${m.category}`"
+          class="input sm"
+          :value="m.mode"
+          :disabled="readOnly || modeBusy === m.category"
+          @change="setMode(m.category, ($event.target as HTMLSelectElement).value as 'explicit' | 'implicit')"
+        >
+          <option value="explicit">逐条响应</option>
+          <option value="implicit">只列偏离，没列出的视为接受</option>
+        </select>
+        <button v-if="m.citations.length" type="button" class="plain cap" @click="openCitation(m.citations[0]!)">依据 · 第 {{ m.citations[0]!.page_no }} 页</button>
+        <span v-if="m.origin === 'human'" class="sign cap"><span aria-hidden="true">✓</span><b>{{ m.set_by?.name }}</b><span>改过</span></span>
+        <span v-else-if="MODE_STATUS[m.status]" class="hint-warn cap">{{ MODE_STATUS[m.status] }}</span>
+      </div>
+    </div>
+
     <div v-for="w in cl?.warnings ?? []" :key="w.code" class="alert warn warn-row" role="note">
       <span class="ico w" aria-hidden="true">!</span>
       <p>{{ w.message }}</p>
@@ -423,6 +467,31 @@ onBeforeUnmount(() => window.removeEventListener("keydown", onKey));
 </template>
 
 <style scoped>
+/* 响应方式（C12）：清单栏下面一行，每类一个选择框 */
+.modes {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: var(--sp-2) var(--sp-6);
+  margin-bottom: var(--sp-3);
+}
+.modes .mode {
+  display: flex;
+  align-items: center;
+  gap: var(--sp-2);
+}
+.modes label {
+  font-size: var(--fs-caption);
+  color: var(--text-secondary);
+  white-space: nowrap;
+}
+.modes .sign {
+  margin: 0;
+  white-space: nowrap;
+}
+.modes > .cap {
+  white-space: nowrap;
+}
 /* 清单栏：标题 + 清单状态；右侧页面级操作（主按钮一个，Q12） */
 .cl-bar {
   display: flex;