feat(infra): dav_delete_resource — DELETE de recurso CardDAV/CalDAV (grupo dav)

Completa el CRUD del grupo dav (put/get/list/get-collection/delete). HTTP DELETE
con Basic auth, If-Match opcional para borrado condicional, maneja 404 como
idempotente. Solo stdlib. 7 tests deterministas (monkeypatch urlopen). Probado
contra Xandikos real durante la limpieza del ciclo de sync OSINT.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

python/functions/infra/__init__.py

@@ -10,6 +10,14 @@ from .hoppscotch_list_requests import hoppscotch_list_requests
 from .pass_get_secret import pass_get_secret
 from .hoppscotch_set_environment import hoppscotch_set_environment
 from .hoppscotch_run_request import hoppscotch_run_request
+from .split_vcards import split_vcards
+from .split_vevents_to_vcalendars import split_vevents_to_vcalendars
+from .extract_or_make_uid import extract_or_make_uid
+from .carddav_put_vcard import carddav_put_vcard
+from .caldav_put_event import caldav_put_event
+from .dav_list_resources import dav_list_resources
+from .dav_get_resource import dav_get_resource
+from .dav_delete_resource import dav_delete_resource
 
 __all__ = [
     "setup_logger",
@@ -25,4 +33,12 @@ __all__ = [
     "pass_get_secret",
     "hoppscotch_set_environment",
     "hoppscotch_run_request",
+    "split_vcards",
+    "split_vevents_to_vcalendars",
+    "extract_or_make_uid",
+    "carddav_put_vcard",
+    "caldav_put_event",
+    "dav_list_resources",
+    "dav_get_resource",
+    "dav_delete_resource",
 ]