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

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

packages/core/src/database/sqlite.ts

@@ -0,0 +1,8 @@
+export * as Sqlite from "./sqlite"
+
+import { Context } from "effect"
+import type { drizzle } from "drizzle-orm/bun-sqlite"
+
+export type DrizzleClient = ReturnType<typeof drizzle>
+export class Native extends Context.Service<Native, unknown>()("@opencode-ai/core/database/SqliteNative") {}
+export class Drizzle extends Context.Service<Drizzle, DrizzleClient>()("@opencode-ai/core/database/SqliteDrizzle") {}