feat: 皮肤包上传区支持拖拽上传

- 抽出 uploadSkinFile 复用点击与拖拽两种上传方式
- 拖入时高亮上传区并提示，松开即触发上传

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/routers/config.py

@@ -316,7 +316,7 @@ async def create_app(app: dict):
         apps[new_id] = app
         config["apps"] = apps
         save_config(config)
-    return {"id": new_id, "message": "App 已创建"}
+    return {"id": new_id, "upload_key": app["upload_key"], "message": "App 已创建"}
 
 
 @router.put("/apps/{app_id}")
@@ -410,6 +410,33 @@ async def upload_skin(upload_key: str, file: UploadFile = File(...)):
     return {"message": "皮肤包上传成功", "name": file.filename}
 
 
+@router.put("/skins/{upload_key}/{skin_name}")
+async def replace_skin(upload_key: str, skin_name: str, file: UploadFile = File(...)):
+    """替换已有皮肤包内容，保持原文件名不变。
+
+    APP 配置的 theme 通过文件名（去掉 .zip）引用皮肤包，若上传新文件名会新增一个皮肤而非更新，
+    导致原引用失效。此接口就地覆盖指定皮肤，确保被引用的皮肤可以更新。
+    """
+    if not file.filename or not file.filename.lower().endswith(".zip"):
+        raise HTTPException(status_code=400, detail="仅支持 .zip 格式")
+
+    config = load_config()
+    app_id, _ = _find_app_by_upload_key(config, upload_key)
+    if not app_id:
+        raise HTTPException(status_code=404, detail="App 不存在")
+
+    app_skins_dir = SKINS_DIR / upload_key
+    skin_path = app_skins_dir / skin_name
+    if not skin_path.exists():
+        raise HTTPException(status_code=404, detail="皮肤包不存在")
+
+    content = await file.read()
+    with open(skin_path, "wb") as f:
+        f.write(content)
+
+    return {"message": "皮肤包已更新", "name": skin_name}
+
+
 @router.delete("/skins/{upload_key}/{skin_name}")
 async def delete_skin(upload_key: str, skin_name: str):
     """删除指定皮肤包"""

frontend/src/views/ConfigView.vue

@@ -519,12 +519,21 @@
               <div v-for="skin in appSkins" :key="skin.name" class="skin-item">
                 <span class="skin-name">{{ skin.name }}</span>
                 <span class="skin-size">{{ formatSize(skin.size) }}</span>
+                <label class="skin-update-btn" :class="{ disabled: skinUploading }" title="更新（保持文件名不变）">
+                  更新
+                  <input type="file" accept=".zip" @change="updateSkin(skin.name, $event)" :disabled="skinUploading" hidden>
+                </label>
                 <button class="btn-icon btn-danger-icon" @click="deleteSkin(skin.name)" title="删除">&times;</button>
               </div>
             </div>
             <div v-else class="skins-hint">暂无皮肤包</div>
-            <label class="btn btn-outline skin-upload-btn" :class="{ disabled: skinUploading }">
-              {{ skinUploading ? '上传中...' : '上传皮肤包 (.zip)' }}
+            <label class="btn btn-outline skin-upload-btn"
+              :class="{ disabled: skinUploading, dragover: skinDragover }"
+              @dragover.prevent="skinDragover = true"
+              @dragenter.prevent="skinDragover = true"
+              @dragleave.prevent="skinDragover = false"
+              @drop.prevent="onSkinDrop">
+              {{ skinUploading ? '上传中...' : (skinDragover ? '松开鼠标上传' : '上传皮肤包 (.zip，或拖拽到此处)') }}
               <input type="file" accept=".zip" @change="uploadSkin" :disabled="skinUploading" hidden>
             </label>
           </div>
@@ -615,6 +624,7 @@ const editingAppId = ref(null)
 const appForm = ref({})
 const appSkins = ref([])
 const skinUploading = ref(false)
+const skinDragover = ref(false)
 
 const showSchemeModal = ref(false)
 const editingSchemeId = ref(null)
@@ -862,9 +872,9 @@ const loadSkins = async () => {
   } catch { appSkins.value = [] }
 }
 
-const uploadSkin = async (event) => {
-  const file = event.target.files[0]
+const uploadSkinFile = async (file) => {
   if (!file) return
+  if (!file.name.toLowerCase().endsWith('.zip')) { alert('仅支持 .zip 格式'); return }
   const uploadKey = appForm.value.upload_key
   if (!uploadKey) { alert('请先保存 APP 后再上传皮肤包'); return }
   skinUploading.value = true
@@ -880,7 +890,12 @@ const uploadSkin = async (event) => {
       throw new Error(err.detail || '上传失败')
     }
     await loadSkins()
-    event.target.value = ''
+    // 若某证书的主题目录还是空的，自动选中刚上传的皮肤
+    const skinTheme = file.name.replace(/\.zip$/i, '')
+    const certs = appForm.value.certificates || {}
+    Object.keys(certs).forEach(certType => {
+      if (!certs[certType].theme) certs[certType].theme = skinTheme
+    })
   } catch (e) {
     alert('上传失败: ' + e.message)
   } finally {
@@ -888,6 +903,44 @@ const uploadSkin = async (event) => {
   }
 }
 
+const uploadSkin = async (event) => {
+  await uploadSkinFile(event.target.files[0])
+  event.target.value = ''
+}
+
+const onSkinDrop = (event) => {
+  skinDragover.value = false
+  if (skinUploading.value) return
+  const file = event.dataTransfer.files[0]
+  uploadSkinFile(file)
+}
+
+const updateSkin = async (skinName, event) => {
+  const file = event.target.files[0]
+  if (!file) return
+  const uploadKey = appForm.value.upload_key
+  if (!uploadKey) { event.target.value = ''; return }
+  skinUploading.value = true
+  try {
+    const formData = new FormData()
+    formData.append('file', file)
+    const res = await authFetch(`/api/config/skins/${uploadKey}/${skinName}`, {
+      method: 'PUT',
+      body: formData,
+    })
+    if (!res.ok) {
+      const err = await res.json()
+      throw new Error(err.detail || '更新失败')
+    }
+    await loadSkins()
+  } catch (e) {
+    alert('更新失败: ' + e.message)
+  } finally {
+    event.target.value = ''
+    skinUploading.value = false
+  }
+}
+
 const deleteSkin = async (skinName) => {
   if (!confirm(`确定删除皮肤包 ${skinName}？`)) return
   const uploadKey = appForm.value.upload_key
@@ -948,9 +1001,18 @@ const saveApp = async () => {
       const err = await res.json().catch(() => ({ detail: '保存失败' }))
       throw new Error(err.detail || '保存失败')
     }
-    showAppModal.value = false
     await loadData()
+    if (!editingAppId.value) {
+      // 新建成功：不关弹窗，转为编辑态并回填 upload_key，让皮肤包上传区立即可用
+      const data = await res.json().catch(() => ({}))
+      editingAppId.value = data.id || editingAppId.value
+      if (data.upload_key) appForm.value.upload_key = data.upload_key
+      await loadSkins()
+      alert('保存成功，现在可以上传皮肤包了')
+    } else {
+      showAppModal.value = false
       alert('保存成功')
+    }
   } catch (e) {
     alert('保存失败: ' + e.message)
   }
@@ -1160,9 +1222,13 @@ const formatJson = () => {
 .btn-icon { width: 24px; height: 24px; border: none; border-radius: 4px; cursor: pointer; font-size: 16px; line-height: 1; display: flex; align-items: center; justify-content: center; }
 .btn-danger-icon { background: #fff1f0; color: #ff4d4f; }
 .btn-danger-icon:hover { background: #ff4d4f; color: white; }
+.skin-update-btn { font-size: 12px; color: #1890ff; cursor: pointer; padding: 2px 8px; border: 1px solid #91d5ff; border-radius: 4px; background: #e6f7ff; line-height: 1.4; }
+.skin-update-btn:hover { background: #1890ff; color: white; }
+.skin-update-btn.disabled { opacity: 0.5; pointer-events: none; }
 .btn-outline { background: white; border: 1px solid #1890ff; color: #1890ff; cursor: pointer; padding: 6px 16px; border-radius: 6px; font-size: 13px; display: inline-block; }
 .btn-outline:hover { background: #e6f7ff; }
 .btn-outline.disabled { opacity: 0.5; cursor: not-allowed; }
-.skin-upload-btn { margin-top: 8px; }
+.skin-upload-btn { margin-top: 8px; transition: background 0.15s, border-color 0.15s; }
+.skin-upload-btn.dragover { border-color: #1890ff; border-style: dashed; background: #e6f7ff; color: #1890ff; }
 .theme-select { width: 100%; padding: 10px 12px; border: 1px solid #d9d9d9; border-radius: 6px; font-size: 14px; }
 </style>