修复工具列表为空的问题，修改工具API返回所有工具而非仅用户工具

backend/src/main/java/pangea/hiagent/controller/ToolController.java

@@ -129,7 +129,7 @@ public class ToolController {
      * 获取工具列表
      */
     @GetMapping
-    @Operation(summary = "获取工具列表", description = "获取当前用户的所有工具")
+    @Operation(summary = "获取工具列表", description = "获取所有可用工具")
     public ApiResponse<List<Tool>> getTools() {
         try {
             String userId = getCurrentUserId();
@@ -137,7 +137,7 @@ public class ToolController {
                 return ApiResponse.error(4001, "用户未认证");
             }
             
-            List<Tool> tools = toolService.getUserTools(userId);
+            List<Tool> tools = toolService.getAllTools();
             return ApiResponse.success(tools, "获取工具列表成功");
         } catch (Exception e) {
             log.error("获取工具列表失败", e);

backend/src/main/java/pangea/hiagent/repository/ToolRepository.java

@@ -22,6 +22,13 @@ public interface ToolRepository extends BaseMapper<Tool> {
     @Select("SELECT * FROM tool WHERE owner = #{owner} AND deleted = 0 ORDER BY created_at DESC")
     List<Tool> findByOwner(String owner);
     
+    /**
+     * 获取所有未删除的工具列表
+     * @return 工具列表
+     */
+    @Select("SELECT * FROM tool WHERE deleted = 0 ORDER BY created_at DESC")
+    List<Tool> findAllActive();
+    
     /**
      * 根据所有者和状态获取工具列表
      * @param owner 所有者ID

backend/src/main/java/pangea/hiagent/service/ToolService.java

@@ -140,7 +140,20 @@ public class ToolService extends ServiceImpl<ToolRepository, Tool> {
      * @return 工具列表
      */
     public List<Tool> getUserTools(String userId) {
-        return toolRepository.findByOwner(userId);
+        List<Tool> userTools = toolRepository.findByOwner(userId);
+        // 如果用户没有工具，返回所有公共工具
+        if (userTools.isEmpty()) {
+            return toolRepository.findAllActive();
+        }
+        return userTools;
+    }
+    
+    /**
+     * 获取所有工具
+     * @return 工具列表
+     */
+    public List<Tool> getAllTools() {
+        return toolRepository.findAllActive();
     }
     
     /**