refactor: migrate EventStore and MessageStore to :outbox-api and :journal-api

- Replaced usages of `:message-store-api` and `:working-memory-api` with `:journal-api`, `:outbox-api`, and `:context-api`.
- Deprecated legacy `EventStore` and `MessageStore` interfaces, added `typealias` for backward compatibility.
- Updated imports across all modules with references to `:journal-api` and `:outbox-api`.
- Introduced `journalRoutes` and `outboxRoutes` in `:server` for audit log and live event stream endpoints.
- Adjusted `Agent` to expose read-only `journal` and `outbox` stores for improved modularity and clarity.
- Removed legacy Event and AgentEvent definitions from `:proto`, migrated to `:outbox-api`.
- Storage-related modules have been updated to support the new APIs consistently.

outbox-api/src/commonMain/kotlin/pw/binom/agentik/outbox/MutableOutboxStore.kt

@@ -1,7 +1,5 @@
 package pw.binom.agentik.outbox
 
-import pw.binom.agentik.proto.CommonEvent
-
 /**
  * Mutable вариант [OutboxStore] — добавляет producer-операцию [append].
  *

outbox-api/src/commonMain/kotlin/pw/binom/agentik/outbox/OutboxStore.kt

@@ -4,7 +4,6 @@ import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.filter
 import kotlinx.coroutines.flow.filterIsInstance
 import kotlin.time.Instant
-import pw.binom.agentik.proto.CommonEvent
 
 /**
  * Bounded-tail event log с автоматическим управлением TTL.