feat(overlay): 覆盖网络线序①–⑮ 代码与测试产物入库

覆盖网络线累积产物（此前只在工作区、未入版本库）：
- 新增 relay 子系统 src/net/relay/**（wire/duplex/server/client/dialer/switcher/directory/identity/keys/placement/network/addr-override/main/index）
- 新增 src/worker/relay-tunnel.ts、src/web/routes/overlay.ts
- 新增观测/演练脚本 overlay-probe、overlay-failover-drill、overlay-keyring、overlay-holepunch、overlay-jitter、overlay-wan、overlay-relaykey-add、relay-mem-calibrate
- 新增测试 12 个（relay / relay-failover / remote-spawner / instance-port / overlay-{network,auth,bootstrap,identity} / remote-user-fs 等）

验收基线：npm test = 162 pass / 0 fail / 1 skip；--scene all = 12 PASS / 0 SKIP / 0 FAIL；overlay-probe = 12/12

package.json

@@ -23,8 +23,8 @@
     "dev": "node lib/cli.js",
     "typecheck": "tsc -p tsconfig.json --noEmit",
     "check:layering": "node scripts/check-layering.mjs",
-    "verify": "npm run build && node scripts/check-layering.mjs && node --test test/db.test.mjs test/local-user-fs.test.mjs test/crash-policy.test.mjs test/locale-pref.test.mjs test/worker-provision.test.mjs test/reachability.test.mjs && node scripts/verify-inject.cjs lib/supervisor/proxy.js && node scripts/verify-static.mjs && node scripts/verify-platform-admin-section.mjs && node scripts/verify-mem-model.mjs && node scripts/verify-model-landing.mjs && node scripts/verify-dsh-install.mjs && node scripts/verify-models-dict.mjs && node scripts/verify-models-render.cjs && node scripts/verify-dsh-compat.mjs && node scripts/verify-my-skills.mjs && node scripts/verify-portal-entry.mjs",
-    "test": "npm run build && node --test test/db.test.mjs test/local-user-fs.test.mjs test/crash-policy.test.mjs test/reachability.test.mjs && node scripts/verify-inject.cjs lib/supervisor/proxy.js",
+    "verify": "npm run build && node scripts/check-layering.mjs && node --test test/db.test.mjs test/local-user-fs.test.mjs test/remote-user-fs.test.mjs test/crash-policy.test.mjs test/locale-pref.test.mjs test/worker-provision.test.mjs test/reachability.test.mjs test/instance-port.test.mjs test/relay.test.mjs test/remote-spawner.test.mjs test/overlay-network.test.mjs test/overlay-auth.test.mjs test/overlay-bootstrap.test.mjs && node scripts/verify-inject.cjs lib/supervisor/proxy.js && node scripts/verify-static.mjs && node scripts/verify-platform-admin-section.mjs && node scripts/verify-mem-model.mjs && node scripts/verify-model-landing.mjs && node scripts/verify-dsh-install.mjs && node scripts/verify-models-dict.mjs && node scripts/verify-models-render.cjs && node scripts/verify-dsh-compat.mjs && node scripts/verify-my-skills.mjs && node scripts/verify-portal-entry.mjs",
+    "test": "npm run build && node --test test/db.test.mjs test/local-user-fs.test.mjs test/remote-user-fs.test.mjs test/crash-policy.test.mjs test/reachability.test.mjs test/instance-port.test.mjs test/relay.test.mjs test/remote-spawner.test.mjs test/overlay-network.test.mjs test/overlay-auth.test.mjs test/overlay-bootstrap.test.mjs test/overlay-identity.test.mjs test/relay-failover.test.mjs && node scripts/verify-inject.cjs lib/supervisor/proxy.js",
     "smoke": "node scripts/smoke.mjs",
     "smoke:admin": "node scripts/smoke-admin.mjs",
     "smoke:auth": "node scripts/smoke-auth.mjs",