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/build.gradle.kts

@@ -1,5 +1,8 @@
 plugins {
     alias(libs.plugins.kotlin.multiplatform)
+    // Нужен для @Serializable на AgentEvent/CommonEvent/Event — все
+    // три типа теперь живут в :outbox-api (см. миграцию из :proto).
+    alias(libs.plugins.kotlin.serialization)
 }
 
 kotlin {
@@ -17,8 +20,11 @@ kotlin {
 
     sourceSets {
         commonMain.dependencies {
-            api(project(":proto"))
+            // :proto больше не нужен — AgentEvent/CommonEvent/Event перенесены
+            // сюда, и они self-contained (Event ссылается только на kotlinx-serialization).
             api(libs.kotlinx.coroutines.core)
+            api(libs.kotlinx.serialization.core)
+            api(libs.kotlinx.serialization.json)
         }
         commonTest.dependencies {
             implementation(kotlin("test"))