feat: Add JWT auth and nomenclature sync to data-entry-app

Integrate shared JWT authentication into data-entry-app:
- Add Oracle pool initialization for auth service
- Add AuthenticationMiddleware to protect API routes
- Update all receipt endpoints to use CurrentUser from JWT
- Add shared auth router (/api/auth/login, /api/auth/refresh)

Add nomenclature synchronization feature:
- Create SQLite models for synced suppliers, local suppliers, and cash registers
- Add nomenclature router with sync triggers and CRUD endpoints
- Add sync service for Oracle → SQLite nomenclature data
- Update nomenclature_service to use synced SQLite data with fallbacks

Create shared frontend components:
- Add shared/frontend/ with LoginView.vue, auth store factory, login.css
- Integrate shared login and auth into data-entry-app frontend
- Add axios-based API service with token refresh interceptor

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -38,8 +38,9 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 **Working on `reports-app/` or `shared/`**:
 → Use instructions from this file (below)
 
-**Working on shared components** (`shared/auth/`, `shared/database/`):
+**Working on shared components** (`shared/auth/`, `shared/database/`, `shared/frontend/`):
 → These are used by BOTH apps - be careful with changes!
+→ `shared/frontend/` contains: LoginView.vue, auth store factory, login styles
 
 ---
 
@@ -48,9 +49,13 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 ### Microservices Structure
 ```
 .
-├── shared/                    # Shared components (DB pool, auth, utils)
-│   ├── database/             # Oracle pool (used by reports-app)
-│   └── auth/                 # JWT auth (used by both apps)
+├── shared/                    # Shared components (DB pool, auth, frontend)
+│   ├── database/             # Oracle pool (used by both apps)
+│   ├── auth/                 # JWT auth (used by both apps)
+│   └── frontend/             # Shared Vue components, stores, styles
+│       ├── components/       # LoginView.vue
+│       ├── stores/           # auth.js (Pinia store factory)
+│       └── styles/           # login.css
 │
 ├── reports-app/              # READ-ONLY reports from Oracle
 │   ├── backend/              # FastAPI API (port 8001)