fix: 修复空 catch 吞异常问题，端口号抽离到配置，统一日志为 Serilog

- 所有空 catch 块补全日志记录，统一使用 Serilog/AppLog
- 按场景分级：Error（意外失败）、Warning（次要问题）、Information（预期内）
- 端口 HttpPort/HttpsPort 抽离到 appsettings.json Server 配置节
- QrCodeService 通过 IConfiguration 读取端口，消除硬编码
- 前端通过 Vite proxy 转发 /api，http.ts 统一使用 origin 地址
- 移除所有 Debug.WriteLine 和 Serilog.Log.Debug 日志

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

FileShare-Services/Services/FileLibrary/FileLibraryService.cs

@@ -223,9 +223,9 @@ namespace FileShare_Services.Services.FileLibrary
                 {
                     await ScanRootAsync(root.Id, cancellationToken);
                 }
-                catch
+                catch (Exception ex)
                 {
-                    // ScanRootAsync records the error on the root. Continue scanning other roots.
+                    Serilog.Log.Warning(ex, "扫描文件库根目录失败 RootId={RootId}", root.Id);
                 }
             }
         }
@@ -378,8 +378,9 @@ namespace FileShare_Services.Services.FileLibrary
                     directories = Directory.EnumerateDirectories(current);
                     files = Directory.EnumerateFiles(current);
                 }
-                catch
+                catch (Exception ex)
                 {
+                    Serilog.Log.Information(ex, "无法枚举目录 {Directory}，已跳过", current);
                     continue;
                 }
 
@@ -460,8 +461,9 @@ namespace FileShare_Services.Services.FileLibrary
             {
                 return drive.IsReady ? selector(drive) : null;
             }
-            catch
+            catch (Exception ex)
             {
+                Serilog.Log.Information(ex, "获取驱动器属性失败，已跳过");
                 return null;
             }
         }