feat: 管理端专家管理完整CRUD(新增创建和删除)

后端:
- ExpertStore.create_expert: 创建专家(含bcrypt密码哈希)
- ExpertStore.delete_expert: 级联删除(咨询+服务关系+专家)
- POST /admin/experts: 创建专家API
- DELETE /admin/experts/{id}: 删除专家API

前端:
- AdminExperts页面加"新增专家"按钮和创建弹窗
- 创建弹窗含姓名/手机号/密码/分类/职称/简介/专长
- 每个专家卡片加删除按钮,二次确认后删除
- api.ts加adminCreateExpert和adminDeleteExpert方法

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

bossai.py

@@ -1519,6 +1519,74 @@ class ExpertStore:
                     return None
         return self.get_expert(expert_id)
 
+    def create_expert(self, name: str, phone: str, password: str,
+                      category: str, title: str = "", bio: str = "",
+                      expertise: str = "", avatar_url: str | None = None,
+                      status: str = "active") -> dict:
+        """创建专家(含登录账号)。
+
+        Args:
+            name: 专家姓名
+            phone: 手机号(登录账号,唯一)
+            password: 明文密码(内部 bcrypt 哈希)
+            category: 分类 legal/decision/emotion/life
+            title: 职称
+            bio: 简介
+            expertise: 擅长领域(逗号分隔)
+            avatar_url: 头像 URL
+            status: active/inactive
+
+        Returns:
+            新建的专家 dict
+
+        Raises:
+            ValueError: 手机号已存在或分类非法
+        """
+        if category not in self.CATEGORIES:
+            raise ValueError(f"分类应为 {self.CATEGORIES} 之一")
+        if status not in ("active", "inactive"):
+            raise ValueError("状态应为 active 或 inactive")
+        import bcrypt
+        hashed = bcrypt.hashpw(password.encode(), bcrypt.gensalt()).decode()
+        with self._conn() as conn:
+            with conn.cursor() as cur:
+                # 检查手机号唯一
+                cur.execute("SELECT 1 FROM experts WHERE phone = %s", (phone,))
+                if cur.fetchone():
+                    raise ValueError("该手机号已注册为专家")
+                cur.execute(
+                    "INSERT INTO experts (name, phone, password, category, title, bio, "
+                    "expertise, avatar_url, status) "
+                    "VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s) "
+                    "RETURNING id, name, phone, category, title, bio, expertise, "
+                    "avatar_url, rate, rating_count, status, created_at",
+                    (name, phone, hashed, category, title or None, bio or None,
+                     expertise or None, avatar_url, status),
+                )
+                r = cur.fetchone()
+        return {"id": r[0], "name": r[1], "phone": r[2], "category": r[3],
+                "title": r[4], "bio": r[5], "expertise": r[6], "avatar_url": r[7],
+                "rate": r[8], "rating_count": r[9], "status": r[10],
+                "created_at": str(r[11])}
+
+    def delete_expert(self, expert_id: int) -> bool:
+        """删除专家(级联删除服务关系和咨询)。
+
+        Returns:
+            True 表示删除成功,False 表示专家不存在
+        """
+        with self._conn() as conn:
+            with conn.cursor() as cur:
+                # 先检查存在
+                cur.execute("SELECT 1 FROM experts WHERE id = %s", (expert_id,))
+                if not cur.fetchone():
+                    return False
+                # 级联删除咨询和服务关系
+                cur.execute("DELETE FROM expert_consultations WHERE expert_id = %s", (expert_id,))
+                cur.execute("DELETE FROM expert_services WHERE expert_id = %s", (expert_id,))
+                cur.execute("DELETE FROM experts WHERE id = %s", (expert_id,))
+                return cur.rowcount > 0
+
     def create_service(self, user_phone: str, expert_id: int,
                       category: str) -> dict:
         """用户选定专家,创建服务关系(待专家确认)。