Match PyProjectConfig shape for pyproject; add pack_id/module_name/source query filters

Two reviewer-requested improvements to GET /node_startup_errors:

1. Emit the pyproject metadata in the same {project: {...}, tool_comfy: {...}}
   shape that comfy_config.config_parser.extract_node_configuration already
   returns, instead of inventing a flat {pack_id, display_name, ...} bag.
   API consumers can now parse the pyproject block straight through the
   shared PyProjectConfig pydantic model. Empty / default-valued leaves
   are pruned by a small recursive _prune_empty helper so the payload
   stays compact, but nesting and field names match the source-of-truth.

2. Add optional source, module_name, and pack_id query parameters
   (combined with AND) so a frontend / Manager can ask ?pack_id=foo
   instead of grep'ing through the whole grouped response. pack_id
   resolves against pyproject.project.name; entries without a parsed
   pyproject are naturally excluded from a pack_id query.

The grouping + filtering + module_path stripping moves into

odes.filter_node_startup_errors so the route handler is a one-liner and
the helper is unit-testable without spinning up an aiohttp app.

Tests: 5 new unit tests covering each filter branch, AND-combination, and
empty-result behaviour, plus an updated pyproject-metadata assertion that
checks the nested PyProjectConfig shape, plus a focused test for the
_prune_empty helper.

tests-unit/node_startup_errors_test.py

@@ -119,11 +119,43 @@ async def test_load_custom_node_attaches_pyproject_metadata(tmp_path):
     entry = nodes.NODE_STARTUP_ERRORS["custom_nodes:MyCoolPack"]
     assert "pyproject" in entry, entry
     py = entry["pyproject"]
-    assert py["pack_id"] == "comfyui-mycoolpack"
-    assert py["display_name"] == "My Cool Pack"
-    assert py["publisher_id"] == "example"
-    assert py["version"] == "1.2.3"
-    assert py["repository"] == "https://github.com/example/comfyui-mycoolpack"
+
+    # Shape must mirror PyProjectConfig 1:1 so consumers can parse it back
+    # through the same pydantic model used by comfy_config.config_parser.
+    project = py["project"]
+    assert project["name"] == "comfyui-mycoolpack"
+    assert project["version"] == "1.2.3"
+    assert project["urls"]["repository"] == "https://github.com/example/comfyui-mycoolpack"
+
+    tool_comfy = py["tool_comfy"]
+    assert tool_comfy["publisher_id"] == "example"
+    assert tool_comfy["display_name"] == "My Cool Pack"
+
+
+def test_prune_empty_drops_empty_leaves_only():
+    src = {
+        "keep_str": "x",
+        "drop_empty_str": "",
+        "drop_none": None,
+        "drop_empty_list": [],
+        "drop_empty_dict": {},
+        "keep_zero": 0,
+        "keep_false": False,
+        "nested": {
+            "drop_me": "",
+            "keep_me": "y",
+            "deeper": {"only_empties": ""},
+        },
+        "list_of_dicts": [{"a": ""}, {"a": "z"}],
+    }
+    result = nodes._prune_empty(src)
+    assert result == {
+        "keep_str": "x",
+        "keep_zero": 0,
+        "keep_false": False,
+        "nested": {"keep_me": "y"},
+        "list_of_dicts": [{"a": "z"}],
+    }
 
 
 @pytest.mark.asyncio
@@ -144,3 +176,78 @@ async def test_load_custom_node_arbitrary_module_parent_passes_through(tmp_path)
     assert await nodes.load_custom_node(module_path, module_parent="future_source") is False
     entry = nodes.NODE_STARTUP_ERRORS["future_source:future_pack"]
     assert entry["source"] == "future_source"
+
+
+# ---------------------------------------------------------------------------
+# Tests for the public reshape/filter helper (nodes.filter_node_startup_errors).
+# The HTTP route is a thin wrapper around this helper, so unit-testing it
+# directly avoids spinning up an aiohttp app while still covering every
+# query-param branch.
+# ---------------------------------------------------------------------------
+
+
+def _seed(*, source, module_name, pack_id=None, module_path="/abs/path"):
+    """Insert a synthetic entry directly into NODE_STARTUP_ERRORS."""
+    entry = {
+        "source": source,
+        "module_name": module_name,
+        "module_path": module_path,
+        "error": "boom",
+        "traceback": "tb",
+        "phase": "import",
+    }
+    if pack_id is not None:
+        entry["pyproject"] = {"project": {"name": pack_id}}
+    nodes.NODE_STARTUP_ERRORS[f"{source}:{module_name}"] = entry
+
+
+def test_filter_node_startup_errors_strips_module_path_and_groups_by_source():
+    _seed(source="custom_nodes", module_name="A", module_path="/x/A")
+    _seed(source="comfy_extras", module_name="B", module_path="/x/B")
+    grouped = nodes.filter_node_startup_errors()
+    assert set(grouped) == {"custom_nodes", "comfy_extras"}
+    assert "module_path" not in grouped["custom_nodes"]["A"]
+    assert "module_path" not in grouped["comfy_extras"]["B"]
+
+
+def test_filter_node_startup_errors_source_filter():
+    _seed(source="custom_nodes", module_name="A")
+    _seed(source="comfy_extras", module_name="B")
+    grouped = nodes.filter_node_startup_errors(source="comfy_extras")
+    assert set(grouped) == {"comfy_extras"}
+    assert set(grouped["comfy_extras"]) == {"B"}
+    # Non-matching source filter returns an empty dict, not an error.
+    assert nodes.filter_node_startup_errors(source="nope") == {}
+
+
+def test_filter_node_startup_errors_module_name_filter():
+    _seed(source="custom_nodes", module_name="A")
+    _seed(source="comfy_extras", module_name="A")  # same name, different source
+    _seed(source="custom_nodes", module_name="C")
+    grouped = nodes.filter_node_startup_errors(module_name="A")
+    # Both A entries (from different sources) survive the filter and stay in
+    # their respective source buckets.
+    assert set(grouped) == {"custom_nodes", "comfy_extras"}
+    assert set(grouped["custom_nodes"]) == {"A"}
+    assert set(grouped["comfy_extras"]) == {"A"}
+
+
+def test_filter_node_startup_errors_pack_id_filter_matches_only_pyproject_entries():
+    _seed(source="custom_nodes", module_name="A", pack_id="comfyui-foo")
+    _seed(source="custom_nodes", module_name="B", pack_id="comfyui-bar")
+    _seed(source="comfy_extras", module_name="C")  # no pyproject at all
+    grouped = nodes.filter_node_startup_errors(pack_id="comfyui-foo")
+    assert set(grouped) == {"custom_nodes"}
+    assert set(grouped["custom_nodes"]) == {"A"}
+    # An entry without a parsed pyproject can never match a pack_id filter.
+    assert nodes.filter_node_startup_errors(pack_id="anything-else") == {}
+
+
+def test_filter_node_startup_errors_filters_combine_with_and():
+    _seed(source="custom_nodes", module_name="A", pack_id="comfyui-foo")
+    _seed(source="comfy_extras", module_name="A", pack_id="comfyui-foo")
+    grouped = nodes.filter_node_startup_errors(
+        source="comfy_extras", pack_id="comfyui-foo"
+    )
+    assert set(grouped) == {"comfy_extras"}
+    assert set(grouped["comfy_extras"]) == {"A"}