用内置有线传输帮助页替换飞书外链。

帮助文档改为应用内 WebView 加载本地 HTML，避免依赖外部平台内容。

Co-authored-by: Cursor <cursoragent@cursor.com>

suixinkanTests/WiredCameraTransferHelpDocumentTests.swift

@@ -0,0 +1,33 @@
+//
+//  WiredCameraTransferHelpDocumentTests.swift
+//  suixinkanTests
+//
+
+import XCTest
+@testable import suixinkan
+
+/// 有线相机传输内置帮助文档资源测试。
+final class WiredCameraTransferHelpDocumentTests: XCTestCase {
+    func testBundledHelpHTMLExists() {
+        let url = WiredCameraTransferHelpDocument.bundledURL()
+        XCTAssertNotNil(url)
+        XCTAssertEqual(url?.pathExtension, "html")
+        XCTAssertTrue(url?.lastPathComponent.hasPrefix(WiredCameraTransferHelpDocument.resourceName) == true)
+    }
+
+    func testBundledHelpHTMLContainsCoreSections() throws {
+        let url = try XCTUnwrap(WiredCameraTransferHelpDocument.bundledURL())
+        let html = try String(contentsOf: url, encoding: .utf8)
+        XCTAssertTrue(html.contains("有线相机传输帮助"))
+        XCTAssertTrue(html.contains("连接相机"))
+        XCTAssertTrue(html.contains("边拍边传"))
+        XCTAssertTrue(html.contains("拍后传输"))
+        XCTAssertTrue(html.contains("历史导入"))
+        XCTAssertTrue(html.contains("索尼相机说明"))
+        XCTAssertTrue(html.contains("常见问题"))
+    }
+
+    func testPageTitle() {
+        XCTAssertEqual(WiredCameraTransferHelpDocument.pageTitle, "帮助文档")
+    }
+}