Add packages/opencode-config and use it

packages/server/scripts/copy-opencode-config.mjs

@@ -0,0 +1,21 @@
+#!/usr/bin/env node
+import { cpSync, existsSync, mkdirSync, rmSync } from "fs"
+import path from "path"
+import { fileURLToPath } from "url"
+
+const __filename = fileURLToPath(import.meta.url)
+const __dirname = path.dirname(__filename)
+const cliRoot = path.resolve(__dirname, "..")
+const sourceDir = path.resolve(cliRoot, "../opencode-config")
+const targetDir = path.resolve(cliRoot, "dist/opencode-config")
+
+if (!existsSync(sourceDir)) {
+  console.error(`[copy-opencode-config] Missing source directory at ${sourceDir}`)
+  process.exit(1)
+}
+
+rmSync(targetDir, { recursive: true, force: true })
+mkdirSync(path.dirname(targetDir), { recursive: true })
+cpSync(sourceDir, targetDir, { recursive: true })
+
+console.log(`[copy-opencode-config] Copied ${sourceDir} -> ${targetDir}`)