[Feature]: CLI tools for entity generation and database operations

**Problem Statement:**
Developers need productivity tools for common ORM operations like generating entities from database schemas or creating boilerplate entity files.

**Proposed Solution:**
Create comprehensive CLI tooling:

```bash
# Entity generation
bun orm entity:generate User --fields="name:string,email:string,age:number"
bun orm entity:from-db --table=users --output=./src/entities/

# Database operations
bun orm db:create
bun orm db:drop
bun orm db:seed
bun orm db:reset

# Schema operations
bun orm schema:sync
bun orm schema:drop
bun orm schema:log
```

**Generated Entity Example:**
```typescript
import { BaseEntity, Entity, PrimaryGeneratedColumn, Column } from 'bun-sqlite-orm';

@Entity('users')
export class User extends BaseEntity {
@PrimaryGeneratedColumn()
id\!: number;

@Column({ type: 'text' })
name\!: string;

@Column({ type: 'text', unique: true })
email\!: string;

@Column({ type: 'integer', nullable: true })
age?: number;
}
```

The issue defines CLI commands for entity generation, database operations, and schema operations, but names no existing files, entry points, or tests. First identify the project's CLI architecture and ORM/database APIs, then clarify which command group is in scope. Done should include an agreed command surface, generated-entity behavior, and tests for the selected operations.

Written by the indexing model from the issue text.