fix: Disable cache discovery for Gmail, Drive, and Sheets API builds to improve performance

app.py

@@ -213,7 +213,7 @@ def send_email(to: str, subject: str, body: str, creds: Credentials = None) -> d
     if creds is None:
         creds = require_credentials()
     return (
-        build("gmail", "v1", credentials=creds)
+        build("gmail",  "v1", credentials=creds, cache_discovery=False)
         .users().messages()
         .send(userId="me", body=_raw_message(to, subject, body))
         .execute()
@@ -240,7 +240,7 @@ def _make_public(service, file_id: str) -> dict:
 
 
 def _drive(creds: Credentials):
-    return build("drive", "v3", credentials=creds)
+    return build("drive",  "v3", credentials=creds, cache_discovery=False)
 
 
 def create_drive_folder(
@@ -342,7 +342,7 @@ def list_drive_files(
 # ============================================================================
 
 def _sheets(creds: Credentials):
-    return build("sheets", "v4", credentials=creds)
+    return build("sheets",  "v4", credentials=creds, cache_discovery=False)
 
 
 def read_sheet(