refactor(mock): remove lib/mock fixtures and empty stores

store/posts.ts

@@ -1,5 +1,4 @@
 import { generateId } from "@/lib/id"
-import { mockPosts } from "@/lib/mock"
 import type { Post, User, UserRole } from "@/lib/types"
 import { create } from "zustand"
 
@@ -22,7 +21,7 @@ interface PostState {
 }
 
 export const usePostStore = create<PostState>((set) => ({
-  posts: mockPosts,
+  posts: [],
   createPost: (input) => {
     const post: Post = {
       id: generateId("post"),