feat: 重构项目结构并添加企业微信集成功能

- 移除旧的用户和物品相关模块及测试
- 添加企业微信路由、服务和认证功能
- 实现企业微信API集成包括获取access_token、用户信息等
- 添加统一响应模型和JWT认证工具
- 重构主应用配置为环境变量驱动
- 清理不必要的文档字符串和注释

tests/test_users.py

@@ -1,92 +0,0 @@
-import pytest
-from fastapi.testclient import TestClient
-from src.main import app
-
-client = TestClient(app)
-
-def test_create_user():
-    response = client.post(
-        "/users/",
-        json={
-            "email": "test@example.com",
-            "first_name": "Test",
-            "last_name": "User",
-            "password": "testpassword"
-        }
-    )
-    assert response.status_code == 201
-    data = response.json()
-    assert data["email"] == "test@example.com"
-    assert "id" in data
-
-def test_read_users():
-    response = client.get("/users/")
-    assert response.status_code == 200
-    data = response.json()
-    assert isinstance(data, list)
-
-def test_read_user():
-    # First create a user
-    response = client.post(
-        "/users/",
-        json={
-            "email": "test2@example.com",
-            "first_name": "Test2",
-            "last_name": "User2",
-            "password": "testpassword"
-        }
-    )
-    assert response.status_code == 201
-    user_id = response.json()["id"]
-    
-    # Then read the user
-    response = client.get(f"/users/{user_id}")
-    assert response.status_code == 200
-    data = response.json()
-    assert data["id"] == user_id
-
-def test_update_user():
-    # First create a user
-    response = client.post(
-        "/users/",
-        json={
-            "email": "test3@example.com",
-            "first_name": "Test3",
-            "last_name": "User3",
-            "password": "testpassword"
-        }
-    )
-    assert response.status_code == 201
-    user_id = response.json()["id"]
-    
-    # Then update the user
-    response = client.put(
-        f"/users/{user_id}",
-        json={
-            "email": "updated@example.com",
-            "first_name": "Updated",
-            "last_name": "User",
-            "password": "updatedpassword"
-        }
-    )
-    assert response.status_code == 200
-    data = response.json()
-    assert data["email"] == "updated@example.com"
-
-def test_delete_user():
-    # First create a user
-    response = client.post(
-        "/users/",
-        json={
-            "email": "test4@example.com",
-            "first_name": "Test4",
-            "last_name": "User4",
-            "password": "testpassword"
-        }
-    )
-    assert response.status_code == 201
-    user_id = response.json()["id"]
-    
-    # Then delete the user
-    response = client.delete(f"/users/{user_id}")
-    assert response.status_code == 204