feat(docker): consolidate to single infra container under gateway_init supervise tree

Collapses the two-container Docker model (gateway + orchestrator) into one
bot-bottle-infra container, matching the macOS and Firecracker backends.

- Dockerfile.infra: now a shared gateway+orchestrator base (COPY bot_bottle
  from orchestrator build, no CMD override)
- Dockerfile.infra.fc: new Firecracker-specific layer (buildah/crun/netavark)
- gateway_init: adds orchestrator daemon with _OPT_IN_DAEMONS gating so it
  only starts when BOT_BOTTLE_GATEWAY_DAEMONS explicitly includes it
- orchestrator/lifecycle: OrchestratorService manages one infra container;
  builds orchestrator (intermediate) then infra; live source bind-mounted at
  /bot-bottle-src with PYTHONPATH so the subprocess uses the checkout
- backend/consolidated_util: extracts provision_bottle + teardown_consolidated
  shared across all three backends; removes duplication in docker/fc/macos
  consolidated_launch modules
- firecracker/infra_vm: builds four images (orchestrator→gateway→infra→infra.fc)
- All unit tests updated and passing (1878 tests)
- PRD status: Draft → Active

tests/unit/test_macos_consolidated_launch.py

@@ -17,6 +17,7 @@ from bot_bottle.git_gate import GitGatePlan
 from bot_bottle.orchestrator.client import RegisteredBottle
 
 _MOD = "bot_bottle.backend.macos_container.consolidated_launch"
+_UTIL = "bot_bottle.backend.consolidated_util"
 
 
 def _egress_plan() -> EgressPlan:
@@ -87,7 +88,7 @@ class TestRegisterAgent(unittest.TestCase):
         *, source_ip: str = "192.168.128.9",
     ):
         with patch(f"{_MOD}.OrchestratorClient", return_value=client), \
-                patch(f"{_MOD}.provision_git_gate", provision or Mock()):
+                patch(f"{_UTIL}.provision_git_gate", provision or Mock()):
             return register_agent(
                 _egress_plan(), _git_plan(),
                 source_ip=source_ip, endpoint=_endpoint(), image_ref="img:1",
@@ -125,8 +126,8 @@ class TestTeardown(unittest.TestCase):
     def test_deregisters_and_deprovisions(self) -> None:
         client = Mock()
         deprovision = Mock()
-        with patch(f"{_MOD}.OrchestratorClient", return_value=client), \
-                patch(f"{_MOD}.deprovision_git_gate", deprovision):
+        with patch(f"{_UTIL}.OrchestratorClient", return_value=client), \
+                patch(f"{_UTIL}.deprovision_git_gate", deprovision):
             teardown_consolidated("b1", orchestrator_url="http://o:8099")
         client.teardown_bottle.assert_called_once_with("b1")
         self.assertEqual("b1", deprovision.call_args.args[1])