refactor: Migrate parseIdInfo() to registry

[AngusHsu]

Description

Migrate the parseIdInfo() function from switch statement to registry lookup.

Parent Epic

#13 - Convert main dispatcher to registry pattern

Depends On

• feat: Implement validator registry #50 - Implement validator registry

Current State

• Large switch statement
• Many empty case statements (to be removed first)

Target State

```typescript
export function parseIdInfo(countryCode: string, id: string): ParsedInfo | null {
const validator = registry.get(countryCode);
if (!validator) {
return null;
}
return validator.parse(id);
}
```

Tasks

• Add parse() to all validators
• Register parse functions
• Replace switch with registry lookup
• Ensure all tests still pass
• Remove old switch code

Acceptance Criteria

• All existing tests pass
• No breaking API changes
• Empty cases removed

Labels

refactor, migration, parse