refactor(core): move database schema ownership (#29068)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

packages/opencode/src/session/llm/request.ts

@@ -1,4 +1,5 @@
 import type { Auth } from "@/auth"
+import { SessionLegacy } from "@opencode-ai/core/session/legacy"
 import type { RuntimeFlags } from "@/effect/runtime-flags"
 import { InstanceState } from "@/effect/instance-state"
 import { Permission } from "@/permission"
@@ -16,7 +17,7 @@ import { mergeDeep } from "remeda"
 const USER_AGENT = `opencode/${InstallationVersion}`
 
 type PrepareInput = {
-  readonly user: MessageV2.User
+  readonly user: SessionLegacy.User
   readonly sessionID: string
   readonly parentSessionID?: string
   readonly model: Provider.Model