feat: complete CalDAV (RFC 4791) and CardDAV (RFC 6352) implementation

- CalDAV: MKCALENDAR, PROPFIND, PUT/GET/DELETE events, REPORT calendar-query
- CardDAV: MKCOL, PROPFIND, PUT/GET/DELETE vCards, REPORT addressbook-query
- Fix routing: move CalDAV/CardDAV to top-level merge() with explicit routes
- Fix DB schema: VARCHAR(36) -> UUID for entity IDs, vcard_data -> vcard
- Fix 15 repository stub methods that returned empty results
- Fix vCard parser in ContactStorageAdapter (was hardcoded stub)
- All operations tested end-to-end in Docker (201/207/200/204 as expected)

src/application/services/trash_service_test.rs

@@ -198,6 +198,14 @@ impl FileWritePort for MockFileRepository {
         unimplemented!()
     }
 
+    async fn rename_file(
+        &self,
+        _file_id: &str,
+        _new_name: &str,
+    ) -> std::result::Result<File, DomainError> {
+        unimplemented!()
+    }
+
     async fn delete_file(&self, _id: &str) -> std::result::Result<(), DomainError> {
         Ok(())
     }