feat(recipes): remove deprecated Repair Metadata feature

The recipe "Repair Metadata" action has been marked Deprecated in the UI
for a while and cannot reliably recover recipes imported from CivitAI URLs
whose REST meta has no resources/hashes and whose image has no embedded
metadata (e.g. CivitAI-only generation data). Drop the feature end to end.

Backend:
- remove repair routes (repair, cancel-repair, recipe/{id}/repair,
  repair-bulk, repair-progress) and their handler mappings/methods
- remove RecipeScanner repair_all_recipes / repair_recipe_by_id /
  _repair_single_recipe and REPAIR_VERSION
- remove WebSocketManager recipe-repair progress channel
- drop repair_version column from the persistent recipe cache
- rematch mutual-exclusion now only checks rematch

Frontend:
- remove repair entries from per-recipe, bulk and global context menus
- remove repairRecipe / repairSelectedRecipes / repairRecipes + cancelRepair
  and the repairBulk API client method/endpoint
- drop recipe-repair i18n keys (synced across locales; doctor keys kept)

Tests/docs: delete test_recipe_repair.py, update scaffolding/routes/ws/
persistent-cache/integration tests and i18n guideline examples.

tests/routes/test_recipe_route_scaffolding.py

@@ -226,15 +226,6 @@ _REMATCH_ROUTE_DEFS = {
     ("GET", "/api/lm/recipes/rematch-progress", "get_rematch_progress"),
 }
 
-_REPAIR_ROUTE_DEFS = {
-    ("POST", "/api/lm/recipes/repair", "repair_recipes"),
-    ("POST", "/api/lm/recipes/cancel-repair", "cancel_repair"),
-    ("POST", "/api/lm/recipe/{recipe_id}/repair", "repair_recipe"),
-    ("POST", "/api/lm/recipes/repair-bulk", "repair_recipes_bulk"),
-    ("GET", "/api/lm/recipes/repair-progress", "get_repair_progress"),
-}
-
-
 def test_rematch_route_definitions_registered():
     registered = {
         (d.method, d.path, d.handler_name)
@@ -243,14 +234,6 @@ def test_rematch_route_definitions_registered():
     assert _REMATCH_ROUTE_DEFS <= registered
 
 
-def test_repair_route_definitions_still_registered():
-    registered = {
-        (d.method, d.path, d.handler_name)
-        for d in recipe_route_registrar.ROUTE_DEFINITIONS
-    }
-    assert _REPAIR_ROUTE_DEFS <= registered
-
-
 def test_rematch_handler_names_resolve_in_to_route_mapping(monkeypatch: pytest.MonkeyPatch):
     """Oracle R1-F4: register_routes KeyErrors at startup if to_route_mapping
     lacks any name present in ROUTE_DEFINITIONS, so the real handler set must

tests/routes/test_recipe_routes.py

@@ -1874,20 +1874,14 @@ async def test_create_from_example_does_not_recompute_stored_autov3(
 def _clean_recipe_run_progress_state():
     """Keep the shared WS manager run-state isolated between tests."""
     ws_manager._recipe_rematch_progress = None
-    ws_manager._recipe_repair_progress = None
     yield
     ws_manager._recipe_rematch_progress = None
-    ws_manager._recipe_repair_progress = None
 
 
 def _set_rematch_running(status: str = "processing") -> None:
     ws_manager._recipe_rematch_progress = {"status": status}
 
 
-def _set_repair_running(status: str = "processing") -> None:
-    ws_manager._recipe_repair_progress = {"status": status}
-
-
 async def test_rematch_recipes_starts_background_run(monkeypatch, tmp_path: Path) -> None:
     async with recipe_harness(monkeypatch, tmp_path) as harness:
         response = await harness.client.post("/api/lm/recipes/rematch")
@@ -1911,15 +1905,6 @@ async def test_rematch_recipes_409_when_rematch_running(monkeypatch, tmp_path: P
         assert "already in progress" in payload["error"].lower()
 
 
-async def test_rematch_recipes_409_when_repair_running(monkeypatch, tmp_path: Path) -> None:
-    async with recipe_harness(monkeypatch, tmp_path) as harness:
-        _set_repair_running()
-        response = await harness.client.post("/api/lm/recipes/rematch")
-        payload = await response.json()
-        assert response.status == 409
-        assert payload["success"] is False
-        assert "already in progress" in payload["error"].lower()
-
 
 async def test_rematch_recipe_409_when_rematch_running(monkeypatch, tmp_path: Path) -> None:
     async with recipe_harness(monkeypatch, tmp_path) as harness: