完善合作获客员备注名：保存时校验长度，弹窗展示 saler_real_name。

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

suixinkanTests/CooperationOrderRemarkNameTests.swift

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+//
+//  CooperationOrderRemarkNameTests.swift
+//  suixinkanTests
+//
+//  Created by Codex on 2026/7/2.
+//
+
+import XCTest
+@testable import suixinkan
+
+/// 合作获客员备注名校验规则测试。
+final class CooperationOrderRemarkNameTests: XCTestCase {
+    /// 测试超出上限时返回错误提示。
+    func testValidationMessageWhenExceedsMaxLength() {
+        let input = String(repeating: "名", count: CooperationOrderRemarkName.maxLength + 1)
+        XCTAssertEqual(
+            CooperationOrderRemarkName.validationMessage(for: input),
+            "备注名不能超过\(CooperationOrderRemarkName.maxLength)个字符"
+        )
+    }
+
+    /// 测试合法长度时不返回错误。
+    func testValidationMessageAcceptsValidRemark() {
+        XCTAssertNil(CooperationOrderRemarkName.validationMessage(for: "张哥"))
+        XCTAssertNil(
+            CooperationOrderRemarkName.validationMessage(
+                for: String(repeating: "名", count: CooperationOrderRemarkName.maxLength)
+            )
+        )
+    }
+
+    /// 测试保存前会去除首尾空白后再校验。
+    func testValidationUsesTrimmedLength() {
+        let inner = String(repeating: "张", count: CooperationOrderRemarkName.maxLength)
+        XCTAssertNil(CooperationOrderRemarkName.validationMessage(for: " \(inner) "))
+        XCTAssertNotNil(CooperationOrderRemarkName.validationMessage(for: " \(inner)多 "))
+    }
+
+    /// 测试去除首尾空白。
+    func testTrimmedRemovesSurroundingWhitespace() {
+        XCTAssertEqual(CooperationOrderRemarkName.trimmed(" 张哥 "), "张哥")
+    }
+}