fix(backend): finish infra_launch rename + base cap after rebase onto main

Reconciles the chunk-1 rebase onto the current main:
- `_network_container_ips` (added on main) raised the pre-rename
  `ConsolidatedLaunchError`; renamed to `InfraLaunchError` to match the rest of
  the rename.
- main grew `backend/base.py` to 563 lines; with the gateway-attach contract
  (39 lines) it is 602, so the guardrail cap moves 600 -> 615. The reconcile
  flow still lives in `backend/gateway_attach.py`, not base.py.

Refs #516, #519.

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

bot_bottle/backend/docker/infra_launch.py

@@ -69,7 +69,7 @@ def _network_container_ips(network: str) -> list[str]:
     ])
     if proc.returncode != 0:
         detail = proc.stderr.strip() or f"exit {proc.returncode}"
-        raise ConsolidatedLaunchError(
+        raise InfraLaunchError(
             f"could not inspect addresses on gateway network {network}: {detail}"
         )
     ips: list[str] = []