Migrate webhook to receipt-first Automation Runs

[rcyw]

Summary

• make dsh-webhook a pure Trigger adapter over the public dsh-automation v0.2 service
• persist verified receipts before idempotent submission and reconcile terminal Runs through a durable event consumer
• remove direct Agent delivery, cold-wake, and duplicated Session outcome tracking
• retain verification, deduplication, replay, persistent callbacks, and listener takeover responsibilities
• split the oversized store into domain, codec/migration, and merge modules; fix repeated cross-process merge preservation and fail closed on lock exhaustion
• add v2-to-v3 migration and English/Chinese operations documentation

Validation

• TypeScript typecheck
• 84 tests
• production and Git-install builds
• self-contained repository gate
• three-plugin local E2E using the real HTTP listener and real AutomationService

Depends on cofy-x/dsh-automation#4. No deepseek-harness changes are required.