feat: 初始版本，圆角主题与首次管理员引导

app/services/images.py

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+import os
+import uuid
+import json
+from PIL import Image, ExifTags
+
+def save_image(file_storage, base_dir):
+    ext = os.path.splitext(file_storage.filename)[1].lower()
+    name = f"{uuid.uuid4().hex}{ext}"
+    original_path = os.path.join(base_dir, name)
+    file_storage.save(original_path)
+    web_path = os.path.join(base_dir, f"web_{name}")
+    thumb_path = os.path.join(base_dir, f"thumb_{name}")
+    with Image.open(original_path) as im:
+        im_web = im.copy()
+        im_web.thumbnail((1600, 1600))
+        im_web.save(web_path)
+        im_thumb = im.copy()
+        im_thumb.thumbnail((400, 400))
+        im_thumb.save(thumb_path)
+        exif = {}
+        try:
+            raw = im.getexif()
+            for k, v in raw.items():
+                tag = ExifTags.TAGS.get(k, str(k))
+                exif[tag] = str(v)
+        except Exception:
+            exif = {}
+    return original_path, web_path, thumb_path, json.dumps(exif)