fix(api): add getThought endpoint and frontend api method to resolve docker tsc build error

frontend/src/lib/api.ts

@@ -309,6 +309,10 @@ export const api = {
     return ensureArray(res);
   },
 
+  async getThought(thoughtId: string): Promise<Thought> {
+    return request<Thought>(`/api/v1/thoughts/${encodeURIComponent(thoughtId)}`);
+  },
+
   async triageAction(
     thoughtId: string,
     action: 'keep' | 'discard' | 'restore',