fix: remove unused module

app/tools/pubmed.py

@@ -1,24 +0,0 @@
-import httpx
-
-
-def search(query: str, top_k: int = 10, db: str = "pubmed"):
-    resp = httpx.get(
-        "https://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi",
-        params={
-            "term": query,
-            "db": db,
-            "retmax": top_k,
-            "retmode": "json",
-        },
-    )
-    id_list = resp.json()["esearchresult"]["idlist"]
-
-    resp = httpx.get(
-        "https://eutils.ncbi.nlm.nih.gov/entrez/eutils/esummary.fcgi",
-        params={
-            "db": db,
-            "id": ",".join(id_list),
-            "retmode": "json",
-        },
-    )
-    return resp.json()