Overlay leftover services and LLM factory into periscope/src (2.44.0).

Copy api_logs, findings normalize/dedupe, billing_hook, datasheet_store,
cost_estimator, storage, purple_parts, email, digikey, and llm factory/types/base
without deleting the inherited dependency copies.

tests/test_native_leftover_services_overlay.py

@@ -0,0 +1,64 @@
+"""Native overlay: leftover services src still imports resolve from src."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+import backend.services.api_logs as api_logs
+import backend.services.billing_hook as billing_hook
+import backend.services.cost_estimator as cost_estimator
+import backend.services.datasheet_store as datasheet_store
+import backend.services.dedupe_findings as dedupe_findings
+import backend.services.digikey as digikey
+import backend.services.email as email
+import backend.services.normalize_findings as normalize_findings
+import backend.services.purple_parts as purple_parts
+import backend.services.storage as storage
+import backend.services.llm.base as llm_base
+import backend.services.llm.factory as llm_factory
+import backend.services.llm.types as llm_types
+
+
+def _src(mod) -> Path:
+    return Path(mod.__file__).resolve()
+
+
+def test_leftover_services_load_from_src():
+    root = Path(__file__).resolve().parents[1]
+    svc = (root / "periscope" / "src" / "backend" / "services").resolve()
+    for mod, name in (
+        (api_logs, "api_logs.py"),
+        (normalize_findings, "normalize_findings.py"),
+        (dedupe_findings, "dedupe_findings.py"),
+        (billing_hook, "billing_hook.py"),
+        (datasheet_store, "datasheet_store.py"),
+        (cost_estimator, "cost_estimator.py"),
+        (storage, "storage.py"),
+        (purple_parts, "purple_parts.py"),
+        (email, "email.py"),
+        (digikey, "digikey.py"),
+    ):
+        path = _src(mod)
+        assert path == svc / name, path
+        assert "Native Periscope overlay" in path.read_text(encoding="utf-8")[:500]
+
+
+def test_leftover_llm_factory_types_base_load_from_src():
+    root = Path(__file__).resolve().parents[1]
+    llm = (root / "periscope" / "src" / "backend" / "services" / "llm").resolve()
+    for mod, name in (
+        (llm_factory, "factory.py"),
+        (llm_types, "types.py"),
+        (llm_base, "base.py"),
+    ):
+        path = _src(mod)
+        assert path == llm / name, path
+        assert "Native Periscope overlay" in path.read_text(encoding="utf-8")[:500]
+
+
+def test_billing_hook_still_null_without_stripe():
+    from backend.services.billing_hook import InsufficientCredits, get_billing
+
+    assert billing_hook.InsufficientCredits is InsufficientCredits
+    billing = get_billing()
+    assert billing.__class__.__name__ in {"NullBilling", "CreditsBilling"}