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/server.js

@@ -8,8 +8,7 @@ const { log, err, dumpRequest, createResponseDumper } = require("./logger");
 const { TARGET_HOSTS, URL_PATTERNS, MODEL_SYNONYMS, getToolForHost } = require("./config");
 const { DATA_DIR, MITM_DIR } = require("./paths");
 const { getCertForDomain } = require("./cert/generate");
-
-const DB_FILE = path.join(DATA_DIR, "db.json");
+const { getMitmAlias } = require("./dbReader");
 const LOCAL_PORT = 443;
 const IS_WIN = process.platform === "win32";
 const ENABLE_FILE_LOG = true;
@@ -108,9 +107,7 @@ function extractModel(url, body) {
 function getMappedModel(tool, model) {
   if (!model) return null;
   try {
-    if (!fs.existsSync(DB_FILE)) return null;
-    const db = JSON.parse(fs.readFileSync(DB_FILE, "utf-8"));
-    const aliases = db.mitmAlias?.[tool];
+    const aliases = getMitmAlias(tool);
     if (!aliases) return null;
     // Normalize via synonym map (e.g., gemini-default → gemini-3-flash)
     const lookup = MODEL_SYNONYMS?.[tool]?.[model] || model;