feat(blog): implement blog structure with post listing, tagging, and layout enhancements (#1962)

* feat(blog): implement blog structure with post listing and tagging functionality

* feat(blog): enhance blog layout and post metadata display with new components

* fix(blog): address PR #1962 review feedback and fix lint issues (#14)

* fix: format

---------

Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com>

frontend/src/content/en/_meta.ts

@@ -22,6 +22,9 @@ const meta: MetaRecord = {
   workspace: {
     type: "page",
   },
+  blog: {
+    type: "page",
+  },
 };
 
 export default meta;

frontend/src/content/en/posts/_meta.ts

@@ -0,0 +1,9 @@
+import type { MetaRecord } from "nextra";
+
+const meta: MetaRecord = {
+  weekly: {
+    title: "Weekly",
+  },
+};
+
+export default meta;

frontend/src/content/en/posts/weekly/2026-04-06.mdx

@@ -0,0 +1,11 @@
+---
+title: Weekly - 2026-04-06
+description: Weekly updates in English.
+date: 2026-04-06
+tags:
+  - DeerFlow Weekly
+---
+
+## Weekly - 2026-04-06
+
+In this week, enenenen

frontend/src/content/zh/_meta.ts

@@ -7,6 +7,9 @@ const meta: MetaRecord = {
   workspace: {
     type: "page",
   },
+  blog: {
+    type: "page",
+  },
 };
 
 export default meta;

frontend/src/content/zh/posts/_meta.ts

@@ -0,0 +1,9 @@
+import type { MetaRecord } from "nextra";
+
+const meta: MetaRecord = {
+  weekly: {
+    title: "周报",
+  },
+};
+
+export default meta;

frontend/src/content/zh/posts/releases/2_0_rc.mdx

@@ -0,0 +1,9 @@
+---
+title: DeerFlow 2.0 RC
+description: DeerFlow 2.0 RC is officially in RC. Here's what you need to know.
+date: 2026-04-08
+tags:
+  - Release
+---
+
+## DeerFlow 2.0 RC 发布

frontend/src/content/zh/posts/weekly/2026-04-06.mdx

@@ -0,0 +1,11 @@
+---
+title: 周报 - 2026-04-06
+description: DeerFlow 中文周报。
+date: 2026-04-06
+tags:
+  - DeerFlow Weekly
+---
+
+## Weekly - 2026-04-06
+
+In this week, xxx