feat(routes-f): implement password strength checker endpoint

[Nacho1499]

closes #564

PR Description:
implemented a self-contained password strength analysis API at /api/routes-f/password-strength. The solution provides a deterministic 0–4 score, human-readable crack time estimates, and actionable security feedback, all while maintaining zero dependencies on global utilities to ensure independent mergeability.

What were you told to do?
Implement a password strength checker endpoint at that returns a score from 0–4, feedback suggestions, and an estimated crack time. The entire implementation must be strictly scoped within the directory with no external dependencies.app/api/routes-f/password-strength/route.tsapp/api/routes-f/

What did you do?
-I developed a fully self-contained module within the directory to ensure zero dependencies on global project folders.app/api/routes-f/
-Created route.ts: Implemented a POST handler that processes passwords without logging sensitive data.
-Created _lib/helpers.ts: Built a deterministic scoring engine using regex for variety checks and a localized blacklist of 50+ common passwords.
-Created _lib/types.ts: Defined internal interfaces for strict TypeScript compliance.
-Created tests/route.test.ts: Wrote unit tests covering all 5 score tiers (0-4) and blacklist overrides.
-Verification: All 5 tests passed successfully using the project's Jest runner.

Final Files Created:
-app/api/routes-f/password-strength/route.ts
-app/api/routes-f/password-strength/_lib/helpers.ts
-app/api/routes-f/password-strength/_lib/types.ts
-app/api/routes-f/password-strength/tests/route.test.ts

Check List (Check all the applicable boxes)
[x] My code follows the code style of this project.
[x] This PR does not contain plagiarized content.
[x] The title and description of the PR is clear and explains the approach.
[x] I am making a pull request against the main branch (left side).
[x] My commit messages styles matches our requested structure.
[x] My code additions will fail neither code linting checks nor unit test.
[x] I am only making changes to files I was requested to.

Local Test Execution:
-npm run test app/api/routes-f/password-strength/

result:
PASS app/api/routes-f/password-strength/tests/route.test.ts
Password Strength Utility
√ Score 0: Known bad password (3 ms)
√ Score 1: Short but unique (1 ms)
√ Score 2: Long but low variety
√ Score 3: Good variety, medium length
√ Score 4: Excellent variety and length (1 ms)

Test Suites: 1 passed, 1 total
Tests: 5 passed, 5 total
Time: 2.936 s

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