feat(P1-1): KPI单值人工录入 — 新增POST /kpis/{id}/values + 前端录入弹窗

M02绩效管理闭环工具：客户/流程/学习层台账数据可直接在KPI详情录入
- 后端: 单值录入(期间+实际值), 同期间重复自动更新, 来源=manual/verified
- 前端: 历史数据Tab新增'录入数据'按钮+弹窗(期间选择+数值输入)
- 验证: C_SATISFACTION 2026-08录入85→更新88, 历史数据联动显示

frontend/src/views/KPIDetail.vue

@@ -145,6 +145,9 @@
         </el-tab-pane>
 
         <el-tab-pane label="历史数据" name="history">
+          <div style="display:flex;justify-content:flex-end;margin-bottom:8px;">
+            <el-button size="small" type="primary" plain @click="openAddValueDialog">➕ 录入数据</el-button>
+          </div>
           <v-chart :option="chartOption" autoresize class="full-width-chart" />
           <el-table :data="values" size="small" class="data-table">
             <el-table-column prop="period" label="期间" width="100" />
@@ -311,6 +314,26 @@
         <el-button @click="showFullNetwork = false">关闭</el-button>
       </template>
     </MyDialog>
+
+    <!-- 录入数据对话框 -->
+    <MyDialog v-model="showAddValue" title="录入KPI数据" :width="420">
+      <el-form label-width="80px">
+        <el-form-item label="KPI">
+          <span>{{ kpi?.kpi_code }} {{ kpi?.kpi_name }}</span>
+        </el-form-item>
+        <el-form-item label="期间">
+          <el-date-picker v-model="addValueForm.period" type="month" value-format="YYYY-MM" placeholder="选择月份" style="width:200px;" />
+        </el-form-item>
+        <el-form-item label="实际值">
+          <el-input-number v-model="addValueForm.actual_value" :precision="2" :step="1" style="width:200px;" />
+          <span style="margin-left:6px;color:#999;font-size:12px;">{{ kpi?.unit || '' }}</span>
+        </el-form-item>
+      </el-form>
+      <template #footer>
+        <el-button @click="showAddValue = false">取消</el-button>
+        <el-button type="primary" :loading="addValueSaving" @click="submitAddValue">保存</el-button>
+      </template>
+    </MyDialog>
   </div>
 </template>
 
@@ -328,6 +351,38 @@ const route = useRoute()
 const kpi = ref<any>(null)
 const values = ref<any[]>([])
 
+// ── 人工录入数据 ──
+const showAddValue = ref(false)
+const addValueSaving = ref(false)
+const addValueForm = ref({ period: '', actual_value: 0 })
+function openAddValueDialog() {
+  const now = new Date()
+  addValueForm.value = {
+    period: `${now.getFullYear()}-${String(now.getMonth() + 1).padStart(2, '0')}`,
+    actual_value: 0,
+  }
+  showAddValue.value = true
+}
+async function submitAddValue() {
+  if (!addValueForm.value.period) { ElMessage.warning('请选择期间'); return }
+  addValueSaving.value = true
+  try {
+    const r: any = await api.post(`/kpis/${kpi.value.id}/values`, {
+      period: addValueForm.value.period,
+      actual_value: addValueForm.value.actual_value,
+    })
+    ElMessage.success(r.message || '已保存')
+    showAddValue.value = false
+    // 刷新历史数据
+    const kv: any = await api.get('/kpis/' + kpi.value.id)
+    values.value = kv.values || []
+  } catch (e: any) {
+    ElMessage.error(e?.response?.data?.detail || e?.message || '保存失败')
+  } finally {
+    addValueSaving.value = false
+  }
+}
+
 // 数值格式化（历史数据对齐显示用）
 function formatValue(v: any) {
   if (v === null || v === undefined || isNaN(Number(v))) return '--'