Enforce 8–100 age range for character creation (DOB bounds, validation, translations)

[rojinc]

Summary
This PR ensures character birthdates are realistic by enforcing a minimum age of 8 and a maximum age of 100. It adds front-end limits to the date picker, hard validation in CharacterValidator, a sensible default DOB, and new translation strings for friendly error messages.

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What’s changed

1) app.js

• DOB bounds: Adds computed properties minDOB and maxDOB (today−100y, today−8y).
• Sensible default DOB: Sets registerData.date to yearsAgo(21) on mount and when resetting the form.
• Clamping: Watches registerData.date and clamps any manual input/paste into the allowed range.
• Helpers: Adds localISO() and yearsAgo() utilities so dates are timezone-safe (local YYYY-MM-DD).

2) validation.js

• Age rules: Adds isTooYoung(value, 8) and isTooOld(value, 100); integrates them into the date validators array.
• Date helpers: Adds parseISODate() and todayUTC() to avoid timezone edge cases.
• Calendar validation: Keeps isValidDate focused purely on real dates; age range is enforced separately.

3) index.html (or your Vue template)

• Date picker limits: Sets :min="minDOB" and :max="maxDOB" on <v-date-picker> so users can only pick valid birthdays.

<v-date-picker
  v-model="registerData.date"
  :min="minDOB"
  :max="maxDOB"
>
</v-date-picker>

4) Translations

• Adds two new keys for age validation messages so the UI can explain why a date was rejected.

JS / i18n (if you keep translations in JS)

age_too_young: "Birthdate must make your character at least 8 years old.",
age_too_old: "Birthdate cannot make your character older than 100 years.",

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Rationale

• Prevents unrealistic/abusive ages and keeps servers consistent.
• Enforces constraints both in UI (picker bounds) and logic (validator), so manual edits/pastes can’t bypass checks.
• Handles timezone edge cases by normalizing to local date strings and UTC cutoffs.

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How to test

1. Open the character creation form.

2. Verify the date picker won’t allow dates newer than today−8y or older than today−100y.

3. Try manually typing a too-young date (e.g., 7y 364d ago) → should show age_too_young.

4. Try manually typing a too-old date (e.g., 100y + 1 day ago) → should show age_too_old.

5. Boundary checks:

   • Exactly 8 years ago → allowed.
   • Exactly 100 years ago → allowed.

6. Try an invalid calendar date (e.g., 2023-02-30) → should show invalid_date.

7. Confirm successful creation with an in-range DOB (e.g., 21y ago).

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Backward compatibility

• Non-breaking for existing characters.

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Security / performance

• Front-end only changes; no server API surface impacted.
• Minimal overhead: simple date computations and validator checks.

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Commit summary

• Add age validation messages for character creation
• Implement age validation in CharacterValidator
• Modify default date and add DOB computed properties
• Update date-picker min and max attributes

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Checklist (maintainers/authors)

• Have you loaded this code into an updated QBCore project and tested all functionality?

  • Yes
  • No

• Does your code fit the style guidelines?

  • Yes
  • No

• Does your PR fit the contribution guidelines?

  • Yes
  • No

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