Merge remote-tracking branch 'origin/master' into gitea/feature/end

Resolved conflicts taking origin/master (v0.5.55) as canonical, with local
features re-applied:
- runtime log level (LOG_LEVEL env + dashboard Settings → Logging, applied
  immediately and persisted across restarts)
- free/noAuth provider enable/disable toggle via providerStrategies.enabled
- parallel model testing (Test All Models / Test Selected Keys)

cli/scripts/buildMitm.js

@@ -12,7 +12,8 @@ const BUILD_CONFIG = {
 
 const cliDir = path.resolve(__dirname, "..");
 const appDir = path.resolve(cliDir, "..");
-const cliMitmDir = path.join(cliDir, "app", "src", "mitm");
+const cliAppDir = process.env.NINEROUTER_CLI_APP_DIR || path.join(cliDir, "app");
+const cliMitmDir = path.join(cliAppDir, "src", "mitm");
 // Bundle everything — no externals. This keeps MITM runtime self-contained so
 // it can be copied to DATA_DIR/runtime/ and spawned from there (escapes
 // node_modules file locks that block `npm i -g 9router@latest` on Windows).