Initial commit: clean project structure

- Backend: FastAPI + SQLAlchemy + Celery (Python 3.11+)
- Frontend: Vue 3 + TypeScript + Pinia + Tailwind
- Admin Frontend: separate Vue 3 app for management
- Docker Compose: 9 services orchestration
- Specs: design prototypes, memory system PRD, product roadmap

Cleanup performed:
- Removed temporary debug scripts from backend root
- Removed deprecated admin_app.py (embedded UI)
- Removed duplicate docs from admin-frontend
- Updated .gitignore for Vite cache and egg-info

admin-frontend/src/main.ts

@@ -0,0 +1,14 @@
+import { createApp } from 'vue'
+import { createPinia } from 'pinia'
+import router from './router'
+import App from './App.vue'
+import i18n from './i18n'
+import './style.css'
+
+const app = createApp(App)
+
+app.use(createPinia())
+app.use(router)
+app.use(i18n)
+
+app.mount('#app')