Story 2.2: Triển khai API Tải lên & Giới hạn Rate Limit (Upload API & Rate Limiting)

Status: done Epic: Epic 2 Story Key: 2-2-upload-api-rate-limiting

📖 Story Requirements (Context & PRD)

This section maps directly to the original Product Requirements Document and Epics definition.

As a Kỹ sư Backend, I want xây dựng endpoint FastAPI cho việc upload tài liệu kèm cơ chế Rate Limit, So that server tiếp nhận an toàn và ngăn chặn upload spam quá mức hệ thống cho phép. Acceptance Criteria: Given người dùng đăng nhập hợp lệ When đính kèm file và gửi POST tới /api/v1/documents Then hệ thống check bộ nhớ đệm, lưu file vô Storage, tạo record ở DB với status 'Queue', và trigger đẩy task vào Celery. (Phần giới hạn Rate Limit (429) sẽ được triển khai chính thức ở Epic 5 - Usage Quota)

🏗️ Architecture & Technical Guardrails

Critical instructions for the development agent based on the project's established architecture.

Technical Requirements

Language/Framework: React, Next.js (TypeScript) for Web; FastAPI (Python) for Backend.
Database: Prisma/Supabase.
Strict Type checking must be enforced. No any types.

Code Organization

This story is currently marked as done. Implementation should target the following components/files:

(Files to be determined during implementation)

Developer Agent Constraints

No Destructive Refactors: Extend existing modules when possible.
Context Check: Always refer back to task.md and use Context7 to verify latest SDK usages.
BMad Standard: Update the sprint status using standard metrics.

🧪 Testing & Validation Requirements

All new endpoints must be tested.
Frontend components should gracefully degrade.
Do not introduce regressions into existing user workflows.

📈 Completion Status

(To be updated by the agent when completing this story)

Start Date: _____________
Completion Date: _____________
Key Files Changed:

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