remove :message-store-api and migrate functionality to :journal-api and :reflection-api

- Removed `:message-store-api` module and associated classes (ConversationStore, ReflectionStore, Ids, etc.).
- Migrated reusable components to `:journal-api` (conversation-related) and `:reflection-api` (reflection-related).
- Updated imports and module dependencies across all projects to reflect new structure.
- Adjusted build scripts and tests for compatibility with the new APIs.

storage-ksqlite/build.gradle.kts

@@ -35,8 +35,8 @@ kotlin {
             implementation("pw.binom.db:ksqlite:0.1.1-SNAPSHOT")
             implementation(libs.kotlinx.serialization.json)
 
-            api(project(":message-store-api"))
             api(project(":journal-api"))
+            api(project(":reflection-api"))
             api(project(":context-api"))
         }
         commonTest.dependencies {