feat(server): add authenticated remote access and desktop bootstrap

Adds cookie-based login with a bootstrap token flow for desktop apps, secures OpenCode instance traffic with per-instance Basic auth, and updates UI/plugin clients to use credentials.

packages/server/scripts/copy-auth-pages.mjs

@@ -0,0 +1,22 @@
+#!/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, "src/server/routes/auth-pages")
+const targetDir = path.resolve(cliRoot, "dist/server/routes/auth-pages")
+
+if (!existsSync(sourceDir)) {
+  console.error(`[copy-auth-pages] Missing auth pages at ${sourceDir}`)
+  process.exit(1)
+}
+
+rmSync(targetDir, { recursive: true, force: true })
+mkdirSync(targetDir, { recursive: true })
+cpSync(sourceDir, targetDir, { recursive: true })
+
+console.log(`[copy-auth-pages] Copied ${sourceDir} -> ${targetDir}`)