feat: add migrations, test scripts, and utility tools

- Add database migrations (006-028) for face recognition, identity, file_uuid
- Add test scripts for ASR, face, search, processing
- Add portal frontend (Tauri)
- Add config, benchmark, and monitoring utilities
- Add model checkpoints and pretrained model references

portal/src/assets/main.css

@@ -0,0 +1,8 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+body {
+  @apply bg-gray-900 text-gray-100;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
+}