feat(frontend): purge all static content fallback files and enforce strict backend-only dynamic rendering

- Delete all legacy static content data files (members.ts, publications.ts, lectures.ts, standards.ts, projects.ts)
- Remove all fallback imports and static fallbacks across all page components
- Enforce strict dynamic runtime fetching where pages render empty datasets when Go backend server is unavailable

refer_landing_page/app/publications/_components/CategoryNav.tsx

@@ -1,7 +1,6 @@
 import React from "react";
 import Link from "next/link";
 import { PUB_CATEGORIES } from "../../../content/categories";
-import { publications as staticPubs, patents as staticPatents } from "../../../content/publications";
 import { PubCategory } from "../../../content/types";
 
 export interface CategoryCounts {
@@ -20,8 +19,7 @@ export function CategoryNav({ currentCategory, counts }: CategoryNavProps) {
     if (counts?.[slug as keyof CategoryCounts] !== undefined) {
       return counts[slug as keyof CategoryCounts]!;
     }
-    if (slug === "patent") return staticPatents.length;
-    return staticPubs.filter((p) => p.category === slug).length;
+    return 0;
   };
 
   return (