init. 初始化项目，并初步完成前端模板样式

article/models.py

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+from django.db import models
+from django_ckeditor_5.fields import CKEditor5Field
+
+from users.models import User, Department
+
+
+# Create your models here.
+
+from django.db import models
+from django.core.exceptions import ValidationError
+
+class Section(models.Model):
+    name = models.CharField('板块名称', max_length=100, unique=True)
+    code = models.SlugField('唯一标识', max_length=50, unique=True, help_text='用于模板或URL识别，建议英文')
+    parent = models.ForeignKey(
+        'self',
+        on_delete=models.CASCADE,
+        null=True,
+        blank=True,
+        related_name='subsections',
+        verbose_name='所属主板块'
+    )
+    order = models.PositiveSmallIntegerField('排序权重', default=0)
+    enabled = models.BooleanField('启用状态', default=True)
+
+    class Meta:
+        verbose_name = '板块'
+        verbose_name_plural = '板块管理'
+        ordering = ('order', 'name')
+
+    def __str__(self):
+        if self.parent:
+            return f"{self.parent.name} → {self.name}"
+        return self.name
+
+    def clean(self):
+        super().clean()
+        # 禁止子板块再设父级（即最多两级）
+        if self.parent and self.parent.parent:
+            raise ValidationError('子板块不能再设置子级，最多只允许一级嵌套。')
+        # 防止自引用
+        if self.pk and self.parent and self.parent.pk == self.pk:
+            raise ValidationError('板块不能以自身为父级。')
+
+    @property
+    def is_sub(self):
+        """是否为子板块"""
+        return self.parent is not None
+
+    @property
+    def is_main(self):
+        """是否为主板块（无父级）"""
+        return self.parent is None
+
+
+class Carousel(models.Model):
+    title = models.CharField("轮播标题", max_length=100)
+    image = models.ImageField("图片", upload_to='carousel/')
+    link_url = models.URLField("跳转链接", blank=True)
+    order = models.IntegerField("排序", default=0)
+    active = models.BooleanField("启用", default=True)
+
+    class Meta:
+        verbose_name = "轮播图"
+        verbose_name_plural = "轮播管理"
+
+
+class Article(models.Model):
+    title = models.CharField("标题", max_length=200)
+    section = models.ForeignKey(Section, on_delete=models.CASCADE, verbose_name="所属板块")
+    author = models.ForeignKey(User, on_delete=models.SET_NULL, null=True, verbose_name="作者")
+    content = CKEditor5Field("正文")  # 需安装 django-ckeditor
+    cover = models.ImageField("封面图", upload_to='articles/', blank=True)
+    is_published = models.BooleanField("已发布", default=True)
+    created_at = models.DateTimeField("创建时间", auto_now_add=True)
+    updated_at = models.DateTimeField("更新时间", auto_now=True)
+
+    class Meta:
+        verbose_name = "文章"
+        verbose_name_plural = "文章管理"
+
+    def __str__(self):
+        return self.title
+
+
+class Notice(models.Model):
+    title = models.CharField("通知标题", max_length=200)
+    content = CKEditor5Field("通知内容")
+    publisher = models.ForeignKey(User, on_delete=models.SET_NULL, null=True, verbose_name="发布人")
+    target_departments = models.ManyToManyField(Department, blank=True, verbose_name="接收部门")  # 可指定发给哪些部门
+    require_sign = models.BooleanField("是否需要签收", default=False)
+    is_published = models.BooleanField("已发布", default=True)
+    created_at = models.DateTimeField("发布时间", auto_now_add=True)
+    updated_at = models.DateTimeField("更新时间", auto_now=True)
+
+    class Meta:
+        verbose_name = "通知"
+        verbose_name_plural = "通知管理"
+
+    def __str__(self):
+        return self.title
+
+
+class NoticeReceipt(models.Model):
+    """签收记录"""
+    notice = models.ForeignKey(Notice, on_delete=models.CASCADE, related_name='receipts')
+    user = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name="签收人")
+    signed_at = models.DateTimeField("签收时间", auto_now_add=True)
+
+    class Meta:
+        unique_together = ('notice', 'user')  # 防止重复签收
+        verbose_name = "签收记录"
+        verbose_name_plural = "签收管理"
+
+    def __str__(self):
+        return f"{self.user.cname} 已签收《{self.notice.title}》"