Add native host management and role-based operator authentication

Introduce an outbound Python host agent, Debian installer, durable remote
operations, immutable game-file libraries, host-aware deployments and ports,
and occupancy-safe campaigns and draining. Native hosts do not require Komodo.

Add administrator, operator and viewer accounts, protected management routes,
secure sessions, password recovery, audit history and separate telemetry tokens.
Document first-admin setup, reporter migration and live-host acceptance checks.

Validation: 1,343 TypeScript tests and 39 agent tests passed, along with type
checking, the production build, compiled SSR/API smoke tests and administrator
recovery. Real Debian/Docker T5/T6 acceptance remains unrun.

src/lib/server/backends/files.ts

@@ -0,0 +1,50 @@
+import * as fs from 'node:fs/promises';
+import { relative, resolve, sep } from 'node:path';
+import { config } from '../config.js';
+import { nativeInstance, nativeRequest } from './native.js';
+
+function remote(path: string) {
+    for (const root of [config.serversRoot, config.t6ServersRoot]) {
+        if (!root) continue;
+        const rel = relative(resolve(root), resolve(path));
+        if (!rel || rel.startsWith('..') || rel.startsWith(sep)) continue;
+        const [name, ...parts] = rel.split(sep);
+        const instance = nativeInstance(name);
+        if (instance) return { instance, path: parts.join('/') || '.' };
+    }
+    return null;
+}
+function missing(path: string): never { throw Object.assign(new Error(`File does not exist: ${path}`), { code: 'ENOENT' }); }
+
+export async function readFile(path: string): Promise<Buffer> {
+    const target = remote(path);
+    if (!target) return fs.readFile(path);
+    const result = await nativeRequest<{ contentBase64: string | null }>(target.instance, 'files.read', { path: target.path });
+    return result.contentBase64 === null ? missing(path) : Buffer.from(result.contentBase64, 'base64');
+}
+
+export async function exists(path: string): Promise<boolean> {
+    try { await stat(path); return true; }
+    catch (error) { if ((error as NodeJS.ErrnoException).code === 'ENOENT') return false; throw error; }
+}
+
+export async function stat(path: string): Promise<{ size: number; mtime: Date; isDirectory(): boolean; isFile(): boolean }> {
+    const target = remote(path);
+    if (!target) return fs.stat(path);
+    const result = await nativeRequest<{ exists?: boolean; size: number; mtime: string | number; isDirectory: boolean; isFile: boolean } | null>(target.instance, 'files.stat', { path: target.path });
+    if (result === null || result.exists === false) return missing(path);
+    return { size: result.size, mtime: new Date(typeof result.mtime === 'number' ? result.mtime * 1000 : result.mtime), isDirectory: () => result.isDirectory, isFile: () => result.isFile };
+}
+
+export async function readdir(path: string, options: { withFileTypes: true }): Promise<{ name: string; isDirectory(): boolean; isFile(): boolean }[]> {
+    const target = remote(path);
+    if (!target) return fs.readdir(path, options);
+    const result = await nativeRequest<{ entries: { name: string; isDirectory: boolean; isFile?: boolean }[] }>(target.instance, 'files.list', { path: target.path });
+    return result.entries.map(entry => ({ name: entry.name, isDirectory: () => entry.isDirectory, isFile: () => entry.isFile ?? !entry.isDirectory }));
+}
+
+export async function nativeTail(path: string, lines: number) {
+    const target = remote(path);
+    if (!target) return undefined;
+    return nativeRequest<import('../fleet/logs.js').TailResult | null>(target.instance, 'logs.read', { path: target.path, lines });
+}