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/mitm/handlers/base.js

@@ -1,6 +1,6 @@
 const { log, err } = require("../logger");
 
-const DEFAULT_LOCAL_ROUTER = "http://localhost:20128";
+const DEFAULT_LOCAL_ROUTER = "http://127.0.0.1:20128";
 const ROUTER_BASE = String(process.env.MITM_ROUTER_BASE || DEFAULT_LOCAL_ROUTER)
   .trim()
   .replace(/\/+$/, "") || DEFAULT_LOCAL_ROUTER;