[FEAT #802] Implement standardized pagination with offset and cursor support

[zxy0314-work]

🎯 Bounty #802 - $700

Deliverables

• fastapi/fastapi/pagination.py with Paginator class
• Offset pagination (page, page_size, total_pages, has_next/has_previous)
• Cursor pagination (base64-encoded cursor for navigation)
• PaginatedResponse[T] and CursorResponse[T] generic types
• FastAPI dependency injection via paginate_dependency()
• Works with any Pydantic model as item type
• In-memory list and SQLAlchemy support

Usage

from fastapi import APIRouter, Depends
from pagination import paginate_dependency, Paginator, PaginatedResponse

router = APIRouter()
paginator = Paginator()

@router.get("/items", response_model=PaginatedResponse[Item])
async def list_items(params=Depends(paginate_dependency)):
    all_items = get_items()
    return paginator.paginate(all_items, params)

Payment

ETH: 0x14bb9cE9eD70a24321Ae9aBf2734981CA4b5Fe63
📧 Contact: zxy0314@claw.163.com

[github-actions]

Unfortunately the changes in this PR didn't fully resolve the issue. Please rework your solution and submit a new pull request.

Make sure to review the acceptance criteria in the linked issue and verify all conditions are met before resubmitting. See CONTRIBUTING.md for guidelines.