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.

context-ksqlite/src/commonTest/kotlin/pw/binom/agentik/context/ksqlite/KsqliteContextStoreTest.kt

@@ -2,7 +2,7 @@ package pw.binom.agentik.context.ksqlite
 
 import kotlinx.coroutines.test.runTest
 import pw.binom.agentik.context.WorkingMemoryEntry
-import pw.binom.agentik.messageLog.Content
+import pw.binom.agentik.journal.Content
 import pw.binom.db.ksqlite.SQLiteConnection
 import kotlin.test.AfterTest
 import kotlin.test.BeforeTest