✨ feat(*): 重构PCB放行流程并接入双扫码校验

- 将流程改为 OMRON FINS + TCP 双扫码 + SFTP 文件校验
- 新增文件校验与扫码结果汇总实现，补充对应单测
- 同步更新流程设计文档、配置和系统设置页面文案

src/AxiOmron.PcbCheck/Services/Implementations/LocalFileCheckProvider.cs

@@ -0,0 +1,179 @@
+using System.IO;
+using AxiOmron.PcbCheck.Models;
+using AxiOmron.PcbCheck.Options;
+using AxiOmron.PcbCheck.Services.Interfaces;
+
+namespace AxiOmron.PcbCheck.Services.Implementations;
+
+/// <summary>
+/// 提供本地磁盘目录的文件存在性校验能力。
+/// </summary>
+public sealed class LocalFileCheckProvider : IFileCheckProvider
+{
+    private readonly IAppLogger<LocalFileCheckProvider> _logger;
+
+    /// <summary>
+    /// 初始化本地文件校验提供程序。
+    /// </summary>
+    /// <param name="logger">日志记录器。</param>
+    public LocalFileCheckProvider(IAppLogger<LocalFileCheckProvider> logger)
+    {
+        _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+    }
+
+    /// <summary>
+    /// 获取当前提供程序对应的通道类型。
+    /// </summary>
+    public FileCheckProvider Provider => FileCheckProvider.Local;
+
+    /// <summary>
+    /// 按条码检查本地目录中是否存在目标文件。
+    /// </summary>
+    /// <param name="barcode">条码内容。</param>
+    /// <param name="config">根配置对象。</param>
+    /// <param name="cancellationToken">取消令牌。取消后立即终止目录枚举。</param>
+    /// <returns>文件校验结果。</returns>
+    public async Task<FileCheckOutcome> CheckFileAsync(string barcode, AppConfig config, CancellationToken cancellationToken)
+    {
+        ArgumentNullException.ThrowIfNull(config);
+        if (string.IsNullOrWhiteSpace(barcode))
+        {
+            return new FileCheckOutcome
+            {
+                Exists = false,
+                IsConfigurationError = true,
+                ErrorMessage = "条码为空，无法执行本地文件查询。"
+            };
+        }
+
+        FileCheckTestOutcome testOutcome = ValidateRootPath(config.FileCheck.Local.RootPath);
+        if (!testOutcome.IsSuccess)
+        {
+            return new FileCheckOutcome
+            {
+                Exists = false,
+                IsConfigurationError = testOutcome.IsConfigurationError,
+                IsSystemError = testOutcome.IsSystemError,
+                ErrorMessage = testOutcome.StatusMessage
+            };
+        }
+
+        return await Task.Run(() => CheckInternal(barcode, config, cancellationToken), cancellationToken).ConfigureAwait(false);
+    }
+
+    /// <summary>
+    /// 测试本地文件校验目录是否可访问。
+    /// </summary>
+    /// <param name="config">根配置对象。</param>
+    /// <param name="cancellationToken">取消令牌。取消后立即终止测试。</param>
+    /// <returns>通道测试结果。</returns>
+    public Task<FileCheckTestOutcome> TestConnectionAsync(AppConfig config, CancellationToken cancellationToken)
+    {
+        ArgumentNullException.ThrowIfNull(config);
+        cancellationToken.ThrowIfCancellationRequested();
+        return Task.FromResult(ValidateRootPath(config.FileCheck.Local.RootPath));
+    }
+
+    /// <summary>
+    /// 在同步上下文中执行本地文件查找。
+    /// </summary>
+    /// <param name="barcode">条码内容。</param>
+    /// <param name="config">根配置对象。</param>
+    /// <param name="cancellationToken">取消令牌。</param>
+    /// <returns>文件校验结果。</returns>
+    private FileCheckOutcome CheckInternal(string barcode, AppConfig config, CancellationToken cancellationToken)
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+
+        try
+        {
+            string rootPath = Path.GetFullPath(config.FileCheck.Local.RootPath);
+            string candidateName = FileCheckPathMatcher.BuildExpectedFileName(barcode, config.FileCheck.FileNamePattern);
+            string? matchedPath = Directory.EnumerateFiles(rootPath)
+                .FirstOrDefault(path =>
+                {
+                    cancellationToken.ThrowIfCancellationRequested();
+                    return FileCheckPathMatcher.IsMatch(Path.GetFileName(path), candidateName, barcode);
+                });
+
+            if (matchedPath is null)
+            {
+                return new FileCheckOutcome
+                {
+                    Exists = false,
+                    ConnectionSucceeded = true,
+                    ErrorMessage = $"未找到与条码 {barcode} 匹配的本地文件。"
+                };
+            }
+
+            return new FileCheckOutcome
+            {
+                Exists = true,
+                ConnectionSucceeded = true,
+                MatchedFilePath = matchedPath
+            };
+        }
+        catch (OperationCanceledException)
+        {
+            throw;
+        }
+        catch (Exception ex) when (ex is IOException or UnauthorizedAccessException or System.Security.SecurityException)
+        {
+            _logger.LogError(ex, "本地文件校验异常");
+            return new FileCheckOutcome
+            {
+                Exists = false,
+                IsSystemError = true,
+                ErrorMessage = $"本地文件校验异常: {ex.Message}"
+            };
+        }
+    }
+
+    /// <summary>
+    /// 验证本地根目录配置和可访问性。
+    /// </summary>
+    /// <param name="rootPath">本地根目录。</param>
+    /// <returns>通道测试结果。</returns>
+    private static FileCheckTestOutcome ValidateRootPath(string rootPath)
+    {
+        if (string.IsNullOrWhiteSpace(rootPath))
+        {
+            return new FileCheckTestOutcome
+            {
+                IsConfigurationError = true,
+                StatusMessage = "本地文件校验目录未配置。"
+            };
+        }
+
+        string fullPath;
+        try
+        {
+            fullPath = Path.GetFullPath(rootPath);
+        }
+        catch (Exception ex) when (ex is ArgumentException or NotSupportedException or PathTooLongException)
+        {
+            return new FileCheckTestOutcome
+            {
+                IsConfigurationError = true,
+                StatusMessage = $"本地文件校验目录配置无效: {ex.Message}"
+            };
+        }
+
+        if (!Directory.Exists(fullPath))
+        {
+            return new FileCheckTestOutcome
+            {
+                IsConfigurationError = true,
+                StatusMessage = $"本地文件校验目录不存在: {fullPath}"
+            };
+        }
+
+        return new FileCheckTestOutcome
+        {
+            IsSuccess = true,
+            ConnectionSucceeded = true,
+            RootPathAccessible = true,
+            StatusMessage = $"本地文件校验目录可访问: {fullPath}"
+        };
+    }
+}