Here's the `routes/__init__.py` file for the FastAPI backend:

```python
from fastapi import APIRouter

from .and import router as and_router
from .user import router as user_router
from .posts import router as posts_router
from .comments import router as comments_router

api_router = APIRouter()

api_router.include_router(and_router, prefix="/ands", tags=["ands"])
api_router.include_router(user_router, prefix="/users", tags=["users"])
api_router.include_router(posts_router, prefix="/posts", tags=["posts"])
api_router.include_router(comments_router, prefix="/comments", tags=["comments"])
```

This file creates a main `APIRouter` instance `api_router` and includes the routers from `and.py`, `user.py`, `posts.py`, and `comments.py` with their respective prefixes and tags.

The prefixes are set to `/ands`, `/users`, `/posts`, and `/comments`, respectively, ensuring that the routes defined in each router file are accessible under the corresponding URL path.

The tags are set to `["ands"]`, `["users"]`, `["posts"]`, and `["comments"]`, respectively. These tags are used for grouping and organizing the API endpoints in the interactive documentation (e.g., Swagger UI or ReDoc).

Make sure to import the necessary router instances from the corresponding files (`and.py`, `user.py`, `posts.py`, and `comments.py`) and include them in the main `api_router` using the `include_router` method.

This file should be placed in the `app/api/v1/routes/` directory, as specified in the project structure.