fix: posts and pages cannot be counted for visits (#3471)

#### What type of PR is this?
/kind bug
/area core
/milestone 2.3.x

#### What this PR does / why we need it:
修复文章和自定义页面缺失 name 模型属性导致的访问量无法计数问题
此为 2.3.0 引入的问题 see #3300

how to test it?
1. 切换文章的路由为不带 name 的规则
2. 访问文章看 `/apis/api.halo.run/v1alpha1/trackers/counter` API 是否有如下参数，且 name 值正确
```json
{
    "group": "content.halo.run",
    "plural": "posts",
    "name": "335",
    "hostname": "localhost",
    "screen": "1920x1080",
    "language": "zh-CN",
    "url": "/?p=halo-150-released",
    "referrer": "http://localhost:8090/?p=how-to-development-a-halo-plugin"
}
```
3. 观察文章访问量是否有增加
4. 重复上述 2、3 步骤检查自定义页面的访问量功能是否正确

#### Which issue(s) this PR fixes:

Fixes #3448

#### Does this PR introduce a user-facing change?
```release-note
修复文章和自定义页面缺失属性导致的访问量无法计数问题
```

src/main/java/run/halo/app/theme/router/SinglePageRoute.java

@@ -127,6 +127,7 @@ public class SinglePageRoute
         return request -> singlePageFinder.getByName(name)
             .flatMap(singlePageVo -> {
                 Map<String, Object> model = new HashMap<>();
+                model.put("name", singlePageVo.getMetadata().getName());
                 model.put("groupVersionKind", gvk);
                 model.put("plural", getPlural());
                 model.put(ModelConst.TEMPLATE_ID, DefaultTemplateEnum.SINGLE_PAGE.getValue());

src/main/java/run/halo/app/theme/router/factories/PostRouteFactory.java

@@ -102,6 +102,7 @@ public class PostRouteFactory implements RouteFactory {
         return postVoMono
             .flatMap(postVo -> {
                 Map<String, Object> model = new HashMap<>();
+                model.put("name", postVo.getMetadata().getName());
                 model.put(ModelConst.TEMPLATE_ID, DefaultTemplateEnum.POST.getValue());
                 model.put("groupVersionKind", GroupVersionKind.fromExtension(Post.class));
                 GVK gvk = Post.class.getAnnotation(GVK.class);

src/test/java/run/halo/app/theme/router/SinglePageRouteTest.java

@@ -0,0 +1,101 @@
+package run.halo.app.theme.router;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.when;
+
+import java.util.Map;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.reactive.server.WebTestClient;
+import org.springframework.web.reactive.function.server.HandlerFunction;
+import org.springframework.web.reactive.function.server.HandlerStrategies;
+import org.springframework.web.reactive.function.server.RouterFunction;
+import org.springframework.web.reactive.function.server.RouterFunctions;
+import org.springframework.web.reactive.function.server.ServerResponse;
+import org.springframework.web.reactive.result.view.ViewResolver;
+import org.springframework.web.server.ServerWebExchange;
+import reactor.core.publisher.Mono;
+import run.halo.app.core.extension.content.SinglePage;
+import run.halo.app.extension.GroupVersionKind;
+import run.halo.app.extension.Metadata;
+import run.halo.app.theme.DefaultTemplateEnum;
+import run.halo.app.theme.finders.SinglePageFinder;
+import run.halo.app.theme.finders.vo.SinglePageVo;
+import run.halo.app.theme.router.factories.ModelConst;
+
+/**
+ * Tests for {@link SinglePageRoute}.
+ *
+ * @author guqing
+ * @since 2.0.0
+ */
+@ExtendWith(MockitoExtension.class)
+class SinglePageRouteTest {
+
+    @Mock
+    private ViewNameResolver viewNameResolver;
+
+    @Mock
+    private SinglePageFinder singlePageFinder;
+
+    @Mock
+    protected ViewResolver viewResolver;
+
+    @InjectMocks
+    private SinglePageRoute singlePageRoute;
+
+    @Test
+    void handlerFunction() {
+        // fix gh-3448
+        when(viewNameResolver.resolveViewNameOrDefault(any(), any(), any()))
+            .thenReturn(Mono.just(DefaultTemplateEnum.POST.getValue()));
+
+        String pageName = "fake-page";
+        when(viewResolver.resolveViewName(any(), any()))
+            .thenReturn(Mono.just(new EmptyView() {
+                @Override
+                public Mono<Void> render(Map<String, ?> model, MediaType contentType,
+                    ServerWebExchange exchange) {
+                    assertThat(model).containsKey(ModelConst.TEMPLATE_ID);
+                    assertThat(model.get(ModelConst.TEMPLATE_ID))
+                        .isEqualTo(DefaultTemplateEnum.SINGLE_PAGE.getValue());
+                    assertThat(model.get("name"))
+                        .isEqualTo(pageName);
+                    assertThat(model.get("plural")).isEqualTo("singlepages");
+                    assertThat(model.get("singlePage")).isNotNull();
+                    assertThat(model.get("groupVersionKind"))
+                        .isEqualTo(GroupVersionKind.fromExtension(SinglePage.class));
+                    return super.render(model, contentType, exchange);
+                }
+            }));
+
+        SinglePage singlePage = new SinglePage();
+        singlePage.setMetadata(new Metadata());
+        singlePage.getMetadata().setName(pageName);
+        singlePage.setSpec(new SinglePage.SinglePageSpec());
+        when(singlePageFinder.getByName(eq(pageName)))
+            .thenReturn(Mono.just(SinglePageVo.from(singlePage)));
+
+        HandlerFunction<ServerResponse> handlerFunction =
+            singlePageRoute.handlerFunction(pageName);
+        RouterFunction<ServerResponse> routerFunction =
+            RouterFunctions.route().GET("/archives/{name}", handlerFunction).build();
+
+        WebTestClient webTestClient = WebTestClient.bindToRouterFunction(routerFunction)
+            .handlerStrategies(HandlerStrategies.builder()
+                .viewResolver(viewResolver)
+                .build())
+            .build();
+
+        webTestClient.get()
+            .uri("/archives/fake-name")
+            .exchange()
+            .expectStatus().isOk();
+    }
+}

src/test/java/run/halo/app/theme/router/factories/PostRouteFactoryTest.java

@@ -75,6 +75,8 @@ class PostRouteFactoryTest extends RouteFactoryTestSuite {
                     assertThat(model).containsKey(ModelConst.TEMPLATE_ID);
                     assertThat(model.get(ModelConst.TEMPLATE_ID))
                         .isEqualTo(DefaultTemplateEnum.POST.getValue());
+                    assertThat(model.get("name"))
+                        .isEqualTo(post.getMetadata().getName());
                     assertThat(model.get("plural")).isEqualTo("posts");
                     assertThat(model.get("post")).isNotNull();
                     assertThat(model.get("groupVersionKind"))