feat(deploy): fix docker deployment and add backend i18n

- Docker Deployment Fixes:
  - Switch base images to docker.m.daocloud.io to resolve registry 401 errors
  - Add Postgres and Redis services to docker-compose.traefik.yml
  - Fix frontend build: replace missing icons (Globe->Location, Chart->TrendCharts)
  - Fix frontend build: resolve pnpm CI/TTY issues and frozen lockfile errors
  - Add missing backend dependencies (sqlalchemy, psycopg2, redis-py, celery, docker-py) in pixi.toml
  - Ensure database tables are created on startup (lifespan event)

- Backend Internationalization (i18n):
  - Add backend/app/core/i18n.py for locale handling
  - Update API endpoints (jobs, tasks, uploads, results) to return localized messages
  - Support 'Accept-Language' header (en/zh)

- Documentation:
  - Update DOCKER_DEPLOYMENT.md with new architecture and troubleshooting
  - Update AGENTS.md with latest stack details and deployment steps
  - Update @fix_plan.md status

Co-Authored-By: Claude <noreply@anthropic.com>

AGENTS.md

@@ -14,29 +14,31 @@ BtToxin Pipeline is an automated Bacillus thuringiensis toxin mining system. It
 | Package Manager | pixi (conda environments) |
 | Pipeline | Python 3.9+ (pandas, matplotlib, seaborn) |
 | Digger Tool | BtToxin_Digger (Perl, BLAST, HMMER) |
-| Frontend | Vue 3 + Vite + Element Plus |
-| Backend | FastAPI + Uvicorn |
+| Frontend | Vue 3 + Vite + Element Plus + vue-i18n |
+| Backend | FastAPI + Uvicorn + SQLAlchemy |
+| Database | PostgreSQL 15 (Metadata) + Redis 7 (Queue) |
 | Result Storage | File system + 30-day retention |
 
 ## Quick Start
 
 ```bash
-# 1. 克隆并安装依赖
+# 1. Clone and install dependencies
 git clone <repo>
 cd bttoxin-pipeline
 pixi install
 
-# 2. 启动前后端服务（推荐）
+# 2. Start services (Docker recommended for full stack)
+# Using DaoCloud mirrors for faster builds in CN
+docker compose -f docker/compose/docker-compose.traefik.yml up -d --build
+
+# Access:
+# Frontend: https://bttiaw.hzau.edu.cn (via Traefik)
+# Backend API: http://localhost:8000 (Internal)
+# Traefik Dashboard: http://localhost:8080
+
+# 3. Development Mode (Local)
 pixi run web-start
-
-# 前端访问: http://localhost:5173
-# 后端 API: http://localhost:8000
-
-# 或者分别启动
-pixi run fe-dev    # 仅前端
-pixi run api-dev   # 仅后端
-
-# 3. 通过网页提交任务
+```
 # - 上传 .fna 基因组文件
 # - 配置参数
 # - 点击提交
@@ -180,7 +182,7 @@ Parameters:
 - min_coverage: float (0-1, default: 0.6)
 - allow_unknown_families: boolean (default: false)
 - require_index_hit: boolean (default: true)
-- lang: "zh" | "en" (default: "zh")
+- lang: "zh" | "en" (default: "zh") - *Now supported via Accept-Language header*
 
 Response:
 {
@@ -283,10 +285,11 @@ docker-compose -f docker-compose.simple.yml up -d
 ### Docker Architecture
 
 ```
-bttoxin-pipeline (single container)
-├── nginx (port 80)        # Reverse proxy + static files
-├── uvicorn (port 8000)    # FastAPI backend
-└── pixi environments      # digger, pipeline, webbackend
+bttoxin-pipeline (Stack)
+├── traefik (reverse proxy, port 80/443)
+├── bttoxin-pipeline (FastAPI + Static Files, port 8000)
+├── bttoxin-postgres (Database, port 5432)
+└── bttoxin-redis (Task Queue, port 6379)
 ```
 
 ### Docker Volume Mounts
@@ -294,11 +297,8 @@ bttoxin-pipeline (single container)
 | Host Path | Container Path | Purpose |
 |-----------|----------------|---------|
 | `./jobs` | `/app/jobs` | Task results |
-| `./frontend/dist` | `/var/www/html` | Frontend static files |
-| `./web` | `/app/web` | Backend code |
-| `./Data` | `/app/Data` | Reference data |
-| `./scripts` | `/app/scripts` | Pipeline scripts |
-| `./pixi.toml` | `/app/pixi.toml` | Pixi configuration |
+| `postgres_data` | `/var/lib/postgresql/data` | Database persistence |
+| ... | ... | Source code mounts (dev) |
 
 ## Task Flow