[feature/backend] overall enhancement of image uploading

backend/config/config.yaml.example

@@ -21,10 +21,50 @@ auth:
     message: "Registration is currently disabled. Please contact administrator."  # 禁用时的提示信息
 
 storage:
-  driver: local
+  type: local  # local or s3
   local:
-    root: storage
-    base_url: http://localhost:8080/storage
+    root_dir: "./storage/media"
+  s3:
+    region: "us-east-1"
+    bucket: "your-bucket-name"
+    access_key_id: "your-access-key-id"
+    secret_access_key: "your-secret-access-key"
+    endpoint: ""      # Optional, for MinIO or other S3-compatible services
+    custom_url: ""    # Optional, for CDN or custom domain (e.g., https://cdn.example.com/media)
+    proxy_s3: false   # If true, backend will proxy S3 requests instead of redirecting
+  upload:
+    limits:
+      image:
+        max_size: 10  # MB
+        allowed_types:
+          - image/jpeg
+          - image/png
+          - image/gif
+          - image/webp
+          - image/svg+xml
+      video:
+        max_size: 500  # MB
+        allowed_types:
+          - video/mp4
+          - video/webm
+      audio:
+        max_size: 50  # MB
+        allowed_types:
+          - audio/mpeg
+          - audio/ogg
+          - audio/wav
+      document:
+        max_size: 20  # MB
+        allowed_types:
+          - application/pdf
+          - application/msword
+          - application/vnd.openxmlformats-officedocument.wordprocessingml.document
+          - application/vnd.ms-excel
+          - application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
+          - application/zip
+          - application/x-rar-compressed
+          - text/plain
+          - text/csv
 
 logging:
   level: debug