Function isStrongPassword

isStrongPassword(password: string, minLength?: number): boolean
Validates if the password is strong.
Parameters
- password: string
  The password to check.
- minLength: number = 8
  The minimum password length. Defaults to 8.
Returns boolean
True if the password meets strength criteria, false otherwise.
Example
```
isStrongPassword("aB3$dEfG"); // true
isStrongPassword("weakpass"); // false
```
- Defined in src/auth/utils.ts:77