fix: 修复GuideController与GuideFamilyTaskController API路径冲突

- GuideController: /api/guide/families 改为 /api/guide/bound-families
- GuideFamilyTaskController保留 /api/guide/families
- 避免Ambiguous mapping错误

zxyj-backend/src/main/java/com/zxyj/controller/GuideController.java

@@ -55,7 +55,7 @@ public class GuideController {
      * 获取绑定的家庭列表
      */
     @Operation(summary = "获取绑定的家庭列表")
-    @GetMapping("/families")
+    @GetMapping("/bound-families")
     public Result<List<Map<String, Object>>> getBoundFamilies(@RequestAttribute("userId") Long userId) {
         List<GuideFamily> bindings = guideFamilyService.getFamiliesByGuide(userId);