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/macos_container/launch.py

@@ -60,6 +60,7 @@ from ..util import AGENT_CA_BUNDLE, AGENT_CA_PATH
 from . import util as container_mod
 from .bottle import MacosContainerBottle
 from .bottle_plan import MacosContainerBottlePlan
+from ...orchestrator.config_store import resolve_teardown_timeout
 from .consolidated_launch import (
     GatewayEndpoint,
     ensure_gateway,
@@ -140,6 +141,7 @@ def launch(
         stack.callback(
             teardown_consolidated, ctx.bottle_id,
             orchestrator_url=ctx.orchestrator_url,
+            timeout=resolve_teardown_timeout(),
         )
         info(
             f"agent {plan.container_name} registered "