feat: Add data-entry-app for fiscal receipts with approval workflow

New application for entering fiscal receipts (bonuri fiscale) with:

Backend (FastAPI + SQLModel + Alembic):
- Receipt, ReceiptAttachment, AccountingEntry models
- CRUD operations with async SQLite database
- Workflow: DRAFT → PENDING_REVIEW → APPROVED/REJECTED
- Auto-generation of accounting entries with VAT calculation
- File upload support (images, PDFs)
- Predefined expense types (Fuel, Materials, Office, etc.)
- Nomenclature service for partners, accounts, cash registers

Frontend (Vue.js 3 + PrimeVue + Pinia):
- ReceiptsListView with filters and stats
- ReceiptCreateView with image upload
- ReceiptDetailView with accounting entries
- ReceiptApprovalView for accountant approval

Documentation:
- REQUIREMENTS.md with functional specifications
- ARCHITECTURE.md with technical decisions
- CLAUDE.md for AI assistant guidance

Phase 1 MVP uses SQLite, prepared for Oracle integration in Phase 2.

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

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

data-entry-app/backend/app/config.py

@@ -0,0 +1,96 @@
+"""Application configuration using pydantic-settings."""
+
+import os
+from pathlib import Path
+from typing import List
+from pydantic_settings import BaseSettings
+from functools import lru_cache
+
+
+class Settings(BaseSettings):
+    """Application settings loaded from environment variables."""
+
+    # App info
+    app_name: str = "Data Entry API"
+    app_version: str = "1.0.0"
+    debug: bool = False
+
+    # API
+    api_host: str = "0.0.0.0"
+    api_port: int = 8003
+
+    # SQLite Database
+    sqlite_database_path: str = "data/receipts.db"
+
+    # File uploads
+    upload_path: str = "data/uploads"
+    max_upload_size_mb: int = 10
+    allowed_mime_types: List[str] = [
+        "image/jpeg",
+        "image/png",
+        "image/gif",
+        "image/webp",
+        "application/pdf",
+    ]
+
+    # Oracle Database (for nomenclatures)
+    oracle_user: str = ""
+    oracle_password: str = ""
+    oracle_host: str = "localhost"
+    oracle_port: int = 1526
+    oracle_sid: str = "ROA"
+
+    # JWT Authentication
+    jwt_secret_key: str = "change-me-in-production"
+    jwt_algorithm: str = "HS256"
+    jwt_expire_minutes: int = 480
+
+    # CORS
+    cors_origins: str = "http://localhost:3010,http://localhost:3000"
+
+    class Config:
+        env_file = ".env"
+        env_file_encoding = "utf-8"
+        extra = "ignore"
+
+    @property
+    def database_url(self) -> str:
+        """Get SQLite database URL for async."""
+        return f"sqlite+aiosqlite:///{self.sqlite_database_path}"
+
+    @property
+    def sync_database_url(self) -> str:
+        """Get SQLite database URL for sync operations (Alembic)."""
+        return f"sqlite:///{self.sqlite_database_path}"
+
+    @property
+    def upload_path_resolved(self) -> Path:
+        """Get resolved upload path."""
+        path = Path(self.upload_path)
+        path.mkdir(parents=True, exist_ok=True)
+        return path
+
+    @property
+    def max_upload_size_bytes(self) -> int:
+        """Get max upload size in bytes."""
+        return self.max_upload_size_mb * 1024 * 1024
+
+    @property
+    def cors_origins_list(self) -> List[str]:
+        """Get CORS origins as list."""
+        return [origin.strip() for origin in self.cors_origins.split(",")]
+
+    @property
+    def oracle_dsn(self) -> str:
+        """Get Oracle DSN string."""
+        return f"{self.oracle_host}:{self.oracle_port}/{self.oracle_sid}"
+
+
+@lru_cache()
+def get_settings() -> Settings:
+    """Get cached settings instance."""
+    return Settings()
+
+
+# Convenience instance
+settings = get_settings()