Fix password validation (Fixes #2737)

[Excali556]

Summary

Previously, password validation relied on SuperTokens' default rules, which led to inconsistent behavior (e.g., requiring alphabet characters). This was not explicitly defined in the codebase and caused confusion during login and signup.

This change explicitly defines a custom password validator in the SuperTokens configuration, enforcing a minimum length of 8 characters. This ensures consistent and predictable behavior.

Testing

Verified locally

• Ran python -m compileall . to ensure no syntax errors

• Manually tested signup and login flows:

  • Passwords shorter than 8 characters are rejected
  • Passwords with 8 or more characters are accepted
  • Numeric-only passwords (≥8 chars) now work correctly

Added or updated tests

N/A

QA follow-up

N/A

Demo

N/A

Checklist

• I have included a video or screen recording for UI changes, or marked Demo as N/A
• Relevant tests pass locally
• Relevant linting and formatting pass locally
• I have signed the CLA, or I will sign it when the bot prompts me

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