Issue #15: Shotgun Surgery (Cross-Cutting Changes)

### **Issue #15: Shotgun Surgery (Cross-Cutting Changes)**
**Location**: Multiple files  
**Type**: Shotgun Surgery  
**Problem**:  
Adding a new field (e.g., `IsApproved`) requires changes to:
1. `BlogComment` class
2. DbContext configuration
3. All query projections
4. Initialization code

**Solution**:
Implement centralized configuration via Fluent API.

