Rewrite leftover HTTP routers except auth.

Project ingest, pipeline enqueue/SSE, reports, admin, contact, survey,
and feedback now resolve from src. Auth router is unchanged.

tests/test_periscope_routers_rewrite.py

@@ -0,0 +1,49 @@
+"""HTTP routers resolve from periscope/src (auth stays leftover)."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+import backend.routers.admin as admin
+import backend.routers.contact as contact
+import backend.routers.deps as deps
+import backend.routers.feedback as feedback
+import backend.routers.pipeline as pipeline
+import backend.routers.projects as projects
+import backend.routers.reports as reports
+import backend.routers.survey as survey
+
+
+def _src(mod, name: str) -> None:
+    path = Path(mod.__file__).resolve()
+    assert path.name == name
+    assert "src" in path.parts
+    assert "Native Periscope overlay" not in path.read_text(encoding="utf-8")[:400]
+
+
+def test_inherited_routers_are_src():
+    for mod, name in (
+        (admin, "admin.py"),
+        (contact, "contact.py"),
+        (deps, "deps.py"),
+        (feedback, "feedback.py"),
+        (pipeline, "pipeline.py"),
+        (projects, "projects.py"),
+        (reports, "reports.py"),
+        (survey, "survey.py"),
+    ):
+        _src(mod, name)
+
+
+def test_auth_router_is_not_rewritten_this_slice():
+    import backend.routers.auth as auth
+
+    path = Path(auth.__file__).resolve()
+    assert path.name == "auth.py"
+    assert "src" in path.parts
+
+
+def test_reprocess_helper_names():
+    assert callable(pipeline._await_terminal)
+    assert callable(pipeline._project_active)
+    assert callable(projects._bom_file_to_csv_bytes)