sync-v2 step 1: worker roles + interactive/bulk queue split

- config: WORKER_ROLE (sync|jobs|all), INTERACTIVE_CONCURRENCY, BULK_CONCURRENCY.
- queue: named queues (interactive/bulk) + enqueue_job() router; sync_bootstrap
  goes to bulk, all other jobs to interactive.
- workers.run: single entrypoint; role=jobs runs both arq consumers (per-queue
  timeout/concurrency), role=sync runs the supervisor, all=both (dev default).
- docker-compose: worker-sync + worker-jobs services (shared image, nofile
  ulimit); backend/Dockerfile; Makefile worker/worker-sync/worker-jobs targets.
- tests repointed to app.queue.get_arq_pool; supervisor behavior unchanged.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/tests/accounts/test_account_api.py

@@ -13,6 +13,7 @@ from sqlalchemy import delete, select
 from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
 from sqlalchemy.pool import NullPool
 
+from app import queue as app_queue
 from app.api import accounts as accounts_api
 from app.config import get_settings
 from app.identity.passwords import hash_password
@@ -114,14 +115,14 @@ async def test_create_account_enqueues_sync(ctx: Ctx, monkeypatch) -> None:  # t
     enqueued: list[tuple[str, str]] = []
 
     class FakePool:
-        async def enqueue_job(self, name: str, arg: str) -> None:
+        async def enqueue_job(self, name: str, arg: str, **kwargs: object) -> None:
             enqueued.append((name, arg))
 
     async def fake_pool() -> FakePool:
         return FakePool()
 
     monkeypatch.setattr(accounts_api, "test_account", fake_test)
-    monkeypatch.setattr(accounts_api, "get_arq_pool", fake_pool)
+    monkeypatch.setattr(app_queue, "get_arq_pool", fake_pool)
 
     resp = await ctx.client.post(
         "/api/accounts",
@@ -151,14 +152,14 @@ async def _make_account(ctx: Ctx, monkeypatch) -> str:  # type: ignore[no-untype
         return None
 
     class FakePool:
-        async def enqueue_job(self, name: str, arg: str) -> None:
+        async def enqueue_job(self, name: str, arg: str, **kwargs: object) -> None:
             return None
 
     async def fake_pool() -> FakePool:
         return FakePool()
 
     monkeypatch.setattr(accounts_api, "test_account", fake_test)
-    monkeypatch.setattr(accounts_api, "get_arq_pool", fake_pool)
+    monkeypatch.setattr(app_queue, "get_arq_pool", fake_pool)
     resp = await ctx.client.post(
         "/api/accounts",
         json={**GOOD_CFG, "email": "me@example.com", "display_name": "Me", "password": "secret"},
@@ -174,13 +175,13 @@ async def test_sync_all_enqueues_refresh_per_account(ctx: Ctx, monkeypatch) -> N
     enqueued: list[tuple[str, str]] = []
 
     class FakePool:
-        async def enqueue_job(self, name: str, arg: str) -> None:
+        async def enqueue_job(self, name: str, arg: str, **kwargs: object) -> None:
             enqueued.append((name, arg))
 
     async def fake_pool() -> FakePool:
         return FakePool()
 
-    monkeypatch.setattr(accounts_api, "get_arq_pool", fake_pool)
+    monkeypatch.setattr(app_queue, "get_arq_pool", fake_pool)
     resp = await ctx.client.post("/api/accounts/sync", headers=_hdr())
     assert resp.status_code == 200
     assert enqueued == [("refresh_account_job", aid)]
@@ -221,7 +222,7 @@ async def test_update_password_reencrypts_and_resyncs(ctx: Ctx, monkeypatch) ->
     enqueued: list[tuple[str, str]] = []
 
     class FakePool:
-        async def enqueue_job(self, name: str, arg: str) -> None:
+        async def enqueue_job(self, name: str, arg: str, **kwargs: object) -> None:
             enqueued.append((name, arg))
 
     async def fake_pool() -> FakePool:
@@ -231,7 +232,7 @@ async def test_update_password_reencrypts_and_resyncs(ctx: Ctx, monkeypatch) ->
         return None
 
     monkeypatch.setattr(accounts_api, "test_account", fake_test)
-    monkeypatch.setattr(accounts_api, "get_arq_pool", fake_pool)
+    monkeypatch.setattr(app_queue, "get_arq_pool", fake_pool)
 
     resp = await ctx.client.patch(
         f"/api/accounts/{aid}", json={"password": "newsecret"}, headers=_hdr()
@@ -259,14 +260,14 @@ async def test_delete_account(ctx: Ctx, monkeypatch) -> None:  # type: ignore[no
         return None
 
     class FakePool:
-        async def enqueue_job(self, name: str, arg: str) -> None:
+        async def enqueue_job(self, name: str, arg: str, **kwargs: object) -> None:
             return None
 
     async def fake_pool() -> FakePool:
         return FakePool()
 
     monkeypatch.setattr(accounts_api, "test_account", fake_test)
-    monkeypatch.setattr(accounts_api, "get_arq_pool", fake_pool)
+    monkeypatch.setattr(app_queue, "get_arq_pool", fake_pool)
 
     created = await ctx.client.post(
         "/api/accounts",