prepare linuxX64: switch to kotlin.uuid.Uuid and ktor-server-cio

1. UUID: java.util.UUID.randomUUID() → commonMain helper Ids.new(prefix)
   wrapping kotlin.uuid.Uuid.random().  kotlin.uuid is stdlib (KMP: jvm +
   all native targets), so the call sites (ChatAgent, ChatConversation,
   SqliteWorkingMemoryStore) are now ready for native builds.  Format kept:
   '<prefix>-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx'.

2. HTTP engine: ktor-server-netty → ktor-server-cio.  Netty is JVM-only;
   CIO is KMP (jvm, linuxX64, ios, etc.) and feature-complete for our
   needs (POST + SSE).  standalone/build.gradle.kts drops netty and adds
   cio; Main.kt imports io.ktor.server.cio.CIO and calls
   embeddedServer(CIO, port = port).

Netty is left in libs.versions.toml (catalog entry kept) in case anyone
needs to fall back; only :standalone stopped depending on it.

E2E verified end-to-end against litellm local/codding: standalone-1.0.0
tarball starts on AGENTIK_PORT, GET /health -> 'ok', POST
/agentik/conversations -> 201 with new UUID-format id, POST .../messages
returns real LLM answer ('Ассистент').  44/44 unit tests green.

gradle/libs.versions.toml

@@ -36,9 +36,10 @@ sqldelight-runtime = { module = "app.cash.sqldelight:runtime", version.ref = "sq
 sqldelight-sqlite-driver = { module = "app.cash.sqldelight:sqlite-driver", version.ref = "sqldelight" }
 sqldelight-coroutines = { module = "app.cash.sqldelight:coroutines-extensions", version.ref = "sqldelight" }
 
-# --- Ktor (сервер, JVM) ---
+# --- Ktor (сервер) ---
 ktor-server-core = { module = "io.ktor:ktor-server-core", version.ref = "ktor" }
 ktor-server-sse = { module = "io.ktor:ktor-server-sse", version.ref = "ktor" }
+ktor-server-cio = { module = "io.ktor:ktor-server-cio", version.ref = "ktor" }
 ktor-server-netty = { module = "io.ktor:ktor-server-netty", version.ref = "ktor" }
 ktor-server-content-negotiation = { module = "io.ktor:ktor-server-content-negotiation", version.ref = "ktor" }
 ktor-serialization-kotlinx-json = { module = "io.ktor:ktor-serialization-kotlinx-json", version.ref = "ktor" }