fix(catalogs): include URL in missing-keys error to match sibling branches

Addresses Copilot review feedback on this PR (round 3).

``_validate_catalog_payload`` advertises in its docstring that the
catalog URL is included in error messages "so the user can tell which
catalog in a multi-catalog stack is malformed" — but the missing-keys
branch raised ``PresetError("Invalid preset catalog format")`` without
the URL, breaking that contract and making multi-catalog debugging
harder. The root-bad-type and nested-bad-type branches in the same
helper already include the URL; this commit brings the middle branch
in line.

For consistency, the same fix is applied to the legacy single-catalog
fetch paths in ``ExtensionCatalog.fetch_catalog`` and
``PresetCatalog.fetch_catalog`` (where the URL was likewise dropped
from the missing-keys error).

The existing regex matchers in the regression tests target the
``"Invalid (preset )?catalog format"`` prefix, which is preserved
verbatim before the ``from <url>`` suffix — no test changes needed.

src/specify_cli/extensions.py

@@ -2012,7 +2012,7 @@ class ExtensionCatalog(CatalogStackBase):
 
             # Validate catalog structure
             if "schema_version" not in catalog_data or "extensions" not in catalog_data:
-                raise ExtensionError("Invalid catalog format")
+                raise ExtensionError(f"Invalid catalog format from {catalog_url}")
 
             # Save to cache
             self.cache_dir.mkdir(parents=True, exist_ok=True)

src/specify_cli/presets.py

@@ -1895,7 +1895,7 @@ class PresetCatalog:
             "schema_version" not in catalog_data
             or "presets" not in catalog_data
         ):
-            raise PresetError("Invalid preset catalog format")
+            raise PresetError(f"Invalid preset catalog format from {url}")
         if not isinstance(catalog_data.get("presets"), dict):
             raise PresetError(
                 f"Invalid preset catalog format from {url}: "
@@ -2199,7 +2199,7 @@ class PresetCatalog:
                 "schema_version" not in catalog_data
                 or "presets" not in catalog_data
             ):
-                raise PresetError("Invalid preset catalog format")
+                raise PresetError(f"Invalid preset catalog format from {catalog_url}")
 
             self.cache_dir.mkdir(parents=True, exist_ok=True)
             self.cache_file.write_text(json.dumps(catalog_data, indent=2))