fix: 修复对照检查页面多项问题

1. 修复「导入范式要求」按钮不显示 - activeParadigm 是对象而非 ID
2. 左右两侧支持多选段落 - 点击切换选中状态
3. 中间指示器显示选中段落数量
4. 多选段落合并后一起发送给 AI 分析

src/components/ComparePanel.vue

@@ -55,13 +55,16 @@
             @click="selectLeftParagraph(idx)"
             :class="[
               'p-3 rounded-lg border cursor-pointer transition-all',
-              selectedLeftIdx === idx 
+              selectedLeftIdxs.includes(idx) 
                 ? 'bg-amber-900/30 border-amber-500 ring-2 ring-amber-500/30' 
                 : 'bg-slate-800/50 border-slate-700 hover:border-amber-500/50'
             ]"
           >
             <div class="flex items-start gap-2">
-              <span class="text-xs text-amber-500/70 shrink-0 mt-0.5">{{ idx + 1 }}.</span>
+              <span :class="['text-xs shrink-0 mt-0.5 w-5 h-5 rounded flex items-center justify-center', 
+                selectedLeftIdxs.includes(idx) ? 'bg-amber-500 text-white' : 'text-amber-500/70']">
+                {{ selectedLeftIdxs.includes(idx) ? '✓' : (idx + 1) }}
+              </span>
               <p class="text-sm text-slate-300 whitespace-pre-wrap">{{ para }}</p>
             </div>
           </div>
@@ -76,16 +79,18 @@
       </div>
 
       <!-- 中间：对应关系指示器 -->
-      <div class="w-16 flex flex-col items-center justify-center bg-slate-800/50 shrink-0">
-        <div v-if="selectedLeftIdx !== null && selectedRightIdx !== null" class="flex flex-col items-center gap-2">
+      <div class="w-20 flex flex-col items-center justify-center bg-slate-800/50 shrink-0">
+        <div v-if="selectedLeftIdxs.length > 0 && selectedRightIdxs.length > 0" class="flex flex-col items-center gap-2">
+          <div class="text-xs text-amber-400 font-medium">{{ selectedLeftIdxs.length }} 段</div>
           <div class="w-3 h-3 rounded-full bg-amber-500"></div>
-          <div class="w-0.5 h-8 bg-gradient-to-b from-amber-500 to-blue-500"></div>
-          <span class="text-xs text-slate-500 writing-mode-vertical">对应</span>
-          <div class="w-0.5 h-8 bg-gradient-to-b from-blue-500 to-blue-500"></div>
+          <div class="w-0.5 h-6 bg-gradient-to-b from-amber-500 to-blue-500"></div>
+          <span class="text-xs text-slate-400 px-1 py-0.5 bg-slate-700 rounded">对照</span>
+          <div class="w-0.5 h-6 bg-gradient-to-b from-blue-500 to-blue-500"></div>
           <div class="w-3 h-3 rounded-full bg-blue-500"></div>
+          <div class="text-xs text-blue-400 font-medium">{{ selectedRightIdxs.length }} 段</div>
         </div>
         <div v-else class="text-center px-2">
-          <span class="text-xs text-slate-600">请选中<br/>两侧段落</span>
+          <span class="text-xs text-slate-600">点击选中<br/>多个段落</span>
         </div>
       </div>
 
@@ -110,13 +115,16 @@
             @click="selectRightParagraph(idx)"
             :class="[
               'p-3 rounded-lg border cursor-pointer transition-all',
-              selectedRightIdx === idx 
+              selectedRightIdxs.includes(idx) 
                 ? 'bg-blue-900/30 border-blue-500 ring-2 ring-blue-500/30' 
                 : 'bg-slate-800/50 border-slate-700 hover:border-blue-500/50'
             ]"
           >
             <div class="flex items-start gap-2">
-              <span class="text-xs text-blue-500/70 shrink-0 mt-0.5">{{ idx + 1 }}.</span>
+              <span :class="['text-xs shrink-0 mt-0.5 w-5 h-5 rounded flex items-center justify-center', 
+                selectedRightIdxs.includes(idx) ? 'bg-blue-500 text-white' : 'text-blue-500/70']">
+                {{ selectedRightIdxs.includes(idx) ? '✓' : (idx + 1) }}
+              </span>
               <p class="text-sm text-slate-300 whitespace-pre-wrap">{{ para }}</p>
             </div>
             <!-- 检查结果标记 -->
@@ -202,7 +210,6 @@
 import { ref, computed } from 'vue'
 import { storeToRefs } from 'pinia'
 import { useAppStore } from '../stores/app'
-import { PARADIGMS } from '../config/paradigms'
 
 const appStore = useAppStore()
 const { activeParadigm } = storeToRefs(appStore)
@@ -211,32 +218,28 @@ const { activeParadigm } = storeToRefs(appStore)
 const leftContent = ref('')
 const rightContent = ref('')
 
-// 选中状态
-const selectedLeftIdx = ref(null)
-const selectedRightIdx = ref(null)
+// 选中状态（改为数组支持多选）
+const selectedLeftIdxs = ref([])
+const selectedRightIdxs = ref([])
 
 // 检查状态
 const isComparing = ref(false)
 const lastCheckResult = ref(null)
 const checkResults = ref({})
 
-// 范式相关
+// 范式相关（activeParadigm 是对象，不是 ID）
 const hasParadigmRules = computed(() => {
-  if (!activeParadigm.value) return false
-  const paradigm = PARADIGMS[activeParadigm.value]
-  return paradigm && (paradigm.expertGuidelines || paradigm.systemConstraints)
+  const p = activeParadigm.value
+  return p && (p.expertGuidelines || p.systemConstraints || p.validationRules)
 })
 
 const activeParadigmName = computed(() => {
-  if (!activeParadigm.value) return ''
-  const paradigm = PARADIGMS[activeParadigm.value]
-  return paradigm?.name || ''
+  return activeParadigm.value?.name || ''
 })
 
 // 导入范式写作要求
 const importParadigmRules = () => {
-  if (!activeParadigm.value) return
-  const paradigm = PARADIGMS[activeParadigm.value]
+  const paradigm = activeParadigm.value
   if (!paradigm) return
   
   const rules = []
@@ -282,24 +285,49 @@ const rightParagraphs = computed(() => {
     .filter(p => p.length > 0)
 })
 
-// 是否可以检查
+// 是否可以检查（两侧都至少选中一段）
 const canCompare = computed(() => {
-  return selectedLeftIdx.value !== null && selectedRightIdx.value !== null
+  return selectedLeftIdxs.value.length > 0 && selectedRightIdxs.value.length > 0
 })
 
-// 选择段落
+// 选择段落（多选切换）
 const selectLeftParagraph = (idx) => {
-  selectedLeftIdx.value = selectedLeftIdx.value === idx ? null : idx
+  const i = selectedLeftIdxs.value.indexOf(idx)
+  if (i === -1) {
+    selectedLeftIdxs.value.push(idx)
+  } else {
+    selectedLeftIdxs.value.splice(i, 1)
+  }
 }
 
 const selectRightParagraph = (idx) => {
-  selectedRightIdx.value = selectedRightIdx.value === idx ? null : idx
+  const i = selectedRightIdxs.value.indexOf(idx)
+  if (i === -1) {
+    selectedRightIdxs.value.push(idx)
+  } else {
+    selectedRightIdxs.value.splice(i, 1)
+  }
+}
+
+// 获取选中的段落文本（多选合并）
+const getSelectedLeftText = () => {
+  return selectedLeftIdxs.value
+    .sort((a, b) => a - b)
+    .map(i => leftParagraphs.value[i])
+    .join('\n\n')
+}
+
+const getSelectedRightText = () => {
+  return selectedRightIdxs.value
+    .sort((a, b) => a - b)
+    .map(i => rightParagraphs.value[i])
+    .join('\n\n')
 }
 
 // 清除选择
 const clearSelection = () => {
-  selectedLeftIdx.value = null
-  selectedRightIdx.value = null
+  selectedLeftIdxs.value = []
+  selectedRightIdxs.value = []
   lastCheckResult.value = null
 }
 
@@ -312,8 +340,8 @@ const goBack = () => {
 const runCompare = async () => {
   if (!canCompare.value) return
   
-  const requirement = leftParagraphs.value[selectedLeftIdx.value]
-  const content = rightParagraphs.value[selectedRightIdx.value]
+  const requirement = getSelectedLeftText()
+  const content = getSelectedRightText()
   
   isComparing.value = true
   lastCheckResult.value = null
@@ -321,10 +349,10 @@ const runCompare = async () => {
   try {
     const prompt = `你是一个严格的写作质检专家。请对比以下"写作要求"和"写作内容"，判断内容是否符合要求。
 
-# 写作要求
+# 写作要求（共 ${selectedLeftIdxs.value.length} 段）
 ${requirement}
 
-# 写作内容
+# 写作内容（共 ${selectedRightIdxs.value.length} 段）
 ${content}
 
 # 输出要求