feat: Add shared components, refactor stores, improve data-entry workflow

Shared Components:
- Add CompanySelector.vue and PeriodSelector.vue components
- Add AppHeader.vue and SlideMenu.vue layout components
- Add shared stores factories (companies.js, accountingPeriod.js)
- Add shared routes factories (companies.py, calendar.py)
- Add shared models (company.py, calendar.py)
- Add shared layout styles (header.css, navigation.css)

Data Entry App:
- Update CLAUDE.md with prod/test server documentation
- Improve nomenclature sync service with better error handling
- Update receipts router and CRUD operations
- Add company/period stores using shared factories
- Update App.vue layout with shared components
- Fix OCRUploadZone file handling

Reports App:
- Refactor stores to use shared factories
- Update App.vue to use shared layout components

Infrastructure:
- Replace start-data-entry.sh with separate dev/test scripts
- Add .claude/rules for authentication, backend patterns, etc.
- Add implementation plan for OCR receipt improvements
- Clean up old documentation files

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

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

shared/models/company.py

@@ -0,0 +1,19 @@
+"""Company models for ROA2WEB applications."""
+
+from typing import List, Optional
+from pydantic import BaseModel
+
+
+class Company(BaseModel):
+    """Model for a company/firma."""
+    id_firma: int
+    name: str
+    schema_name: str
+    fiscal_code: Optional[str] = None
+    is_active: bool = True
+
+
+class CompanyListResponse(BaseModel):
+    """Response model for list of companies."""
+    companies: List[Company]
+    total_count: int