fix: make orchestrator teardown timeout configurable (closes #435)

Resolves via ENV VAR -> orchestrator DB config -> default (30 s, up from 5 s):
  BOT_BOTTLE_ORCHESTRATOR_TEARDOWN_TIMEOUT_SECONDS
  teardown_timeout_seconds key in new orchestrator_config table (bot-bottle.db)

New OrchestratorConfigStore (same DbStore/TableMigrations pattern as the
registry) stores the DB-level setting. resolve_teardown_timeout() implements
the priority chain and is called at stack.callback registration time in all
three backends (macos_container, docker, firecracker).

bot_bottle/backend/docker/consolidated_launch.py

@@ -142,11 +142,19 @@ def launch_consolidated(
 
 
 def teardown_consolidated(
-    bottle_id: str, *, orchestrator_url: str, gateway_name: str = GATEWAY_NAME,
+    bottle_id: str,
+    *,
+    orchestrator_url: str,
+    gateway_name: str = GATEWAY_NAME,
+    timeout: float | None = None,
 ) -> None:
     """Deregister the bottle and remove its git-gate state from the gateway.
     Both steps are idempotent so this is safe from a cleanup trap."""
-    OrchestratorClient(orchestrator_url).teardown_bottle(bottle_id)
+    from ...orchestrator.config_store import DEFAULT_TEARDOWN_TIMEOUT_SECONDS
+    OrchestratorClient(
+        orchestrator_url,
+        timeout=timeout if timeout is not None else DEFAULT_TEARDOWN_TIMEOUT_SECONDS,
+    ).teardown_bottle(bottle_id)
     deprovision_git_gate(DockerGatewayTransport(gateway_name), bottle_id)