feat(db): migrate from lowdb to SQLite with repos pattern

- Add modular DB layer (adapters, migrations, repos, helpers)
- Replace localDb/usageDb/requestDetailsDb monoliths with repos
- Add Tailscale tunnel integration & status check API
- Add /api/cli-tools/all-statuses aggregated endpoint
- Add settingsStore (Zustand) and mitm/dbReader
- Add DB unit tests (benchmark, concurrent, migration, vs-lowdb)

src/shared/constants/config.js

@@ -2,7 +2,7 @@ import pkg from "../../../package.json" with { type: "json" };
 
 // App configuration
 export const APP_CONFIG = {
-  name: "9Router proxy",
+  name: "9Router Proxy",
   description: "AI Infrastructure Management",
   version: pkg.version,
 };
@@ -56,6 +56,9 @@ export const CONSOLE_LOG_CONFIG = {
   pollIntervalMs: 1000,
 };
 
+// Client-side store TTL: how long fetched data stays fresh before re-fetching
+export const CLIENT_STORE_TTL_MS = 60000;
+
 // Provider API endpoints (for display only)
 export const PROVIDER_ENDPOINTS = {
   openrouter: "https://openrouter.ai/api/v1/chat/completions",