refactor: move api types into dedicated file

frontend/src/types/ApiTypes.ts

@@ -0,0 +1,59 @@
+// User Code
+type TopUser = { 
+    author: string; 
+    source: string; 
+    count: number 
+};
+
+type Vocab = {
+  author: string;
+  events: number;
+  total_words: number;
+  unique_words: number;
+  vocab_richness: number;
+  avg_words_per_event: number;
+  top_words: { word: string; count: number }[];
+};
+
+type User = {
+  author: string;
+  post: number;
+  comment: number;
+  comment_post_ratio: number;
+  comment_share: number;
+  vocab?: Vocab | null;
+};
+
+type UserAnalysisResponse = {
+  top_users: TopUser[];
+  users: User[];
+};
+
+type FrequencyWord = {
+    word: string;
+    count: number;
+}
+
+// Summary
+type SummaryResponse = {
+  total_events: number;
+  total_posts: number;
+  total_comments: number;
+  unique_users: number;
+  comments_per_post: number;
+  lurker_ratio: number;
+  time_range: {
+    start: number;
+    end: number;
+  };
+  sources: string[];
+};
+
+export type {
+    TopUser,
+    Vocab,
+    User,
+    UserAnalysisResponse,
+    FrequencyWord,
+    SummaryResponse
+}