feat: initial commit - Go + CGO captcha recognition service

Features:
- Go + CGO ONNX/OpenCV wrapper for high performance
- SQLite (default) / MySQL database support
- Optional Redis caching
- JWT authentication system
- Multiple captcha recognition APIs:
  - OCR text recognition
  - Slider captcha matching
  - Image similarity comparison
  - Rotation captcha detection
  - Object detection
- React frontend with install wizard
- Docker and docker-compose support
- Gitea CI/CD pipeline

Project structure:
- cmd/server: Main entry point
- internal/: Core business logic
- pkg/onnx: ONNX Runtime CGO wrapper
- pkg/opencv: OpenCV CGO wrapper
- web/: React frontend
- deploy/: Deployment configs
- scripts/: Utility scripts

docker-compose.yml

@@ -0,0 +1,40 @@
+version: '3.8'
+
+services:
+  anticaptcha:
+    build: .
+    ports:
+      - "6688:6688"
+    volumes:
+      - ./data:/app/data
+    environment:
+      - TZ=Asia/Shanghai
+      - GIN_MODE=release
+    restart: unless-stopped
+
+  redis:
+    image: redis:7-alpine
+    ports:
+      - "6379:6379"
+    volumes:
+      - redis-data:/data
+    restart: unless-stopped
+    profiles:
+      - redis
+
+  mysql:
+    image: mysql:8
+    ports:
+      - "3306:3306"
+    environment:
+      MYSQL_ROOT_PASSWORD: root123
+      MYSQL_DATABASE: anticaptcha
+    volumes:
+      - mysql-data:/var/lib/mysql
+    restart: unless-stopped
+    profiles:
+      - mysql
+
+volumes:
+  redis-data:
+  mysql-data: