init: 管理会计OS初始代码

包含前后端完整代码：
- 前端：Vue3+Vite+ElementPlus
- 后端：FastAPI+SQLAlchemy
- 模块：驾驶舱/KPI/战略地图/预警/预算/成本/预测/改善行动
- 当前版本：v1.0.0

frontend/src/components/MyDialog.vue

@@ -0,0 +1,91 @@
+<template>
+  <teleport to="body">
+    <div v-if="modelValue" class="my-dialog-overlay" @click.self="close">
+      <div class="my-dialog" :style="{ width: width + 'px' }">
+        <div class="my-dialog-header">
+          <span class="my-dialog-title">{{ title }}</span>
+          <button class="my-dialog-close" @click="close">×</button>
+        </div>
+        <div class="my-dialog-body">
+          <slot />
+        </div>
+        <div v-if="$slots.footer" class="my-dialog-footer">
+          <slot name="footer" />
+        </div>
+      </div>
+    </div>
+  </teleport>
+</template>
+
+<script setup lang="ts">
+defineProps<{
+  modelValue: boolean
+  title?: string
+  width?: number
+}>()
+
+const emit = defineEmits<{
+  (e: 'update:modelValue', v: boolean): void
+}>()
+
+function close() {
+  emit('update:modelValue', false)
+}
+</script>
+
+<style scoped>
+.my-dialog-overlay {
+  position: fixed;
+  inset: 0;
+  background: rgba(0, 0, 0, 0.5);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 10000;
+}
+.my-dialog {
+  background: #fff;
+  border-radius: 8px;
+  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
+  max-width: 90vw;
+  max-height: 85vh;
+  display: flex;
+  flex-direction: column;
+}
+.my-dialog-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 16px 20px;
+  border-bottom: 1px solid #e4e7ed;
+}
+.my-dialog-title {
+  font-size: 16px;
+  font-weight: 600;
+  color: #303133;
+}
+.my-dialog-close {
+  background: none;
+  border: none;
+  font-size: 20px;
+  color: #909399;
+  cursor: pointer;
+  padding: 0 4px;
+  line-height: 1;
+}
+.my-dialog-close:hover {
+  color: #409eff;
+}
+.my-dialog-body {
+  padding: 20px;
+  overflow-y: auto;
+  flex: 1;
+}
+.my-dialog-footer {
+  padding: 12px 20px;
+  border-top: 1px solid #e4e7ed;
+  display: flex;
+  justify-content: flex-end;
+  gap: 8px;
+}
+</style>