Add Pocket CVSS v0.3

[vavkamil]

Application Submission

• Pocket CVSS is an offline CVSS v3.1 base score calculator for Flipper Zero.
• It calculates severity, shows the vector, includes example vectors, and has a severity reference.
• v0.3 includes UI polish and layout cleanup.

Extra Requirements

• No extra hardware or software is required.
• The app runs fully offline on Flipper Zero.

Author Checklist (Fill this out)

• I've read the contribution guidelines and my PR follows them
• I own the code I'm submitting or have code owner's permission to submit it
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have validated the manifest file(s) with
• python3 tools/bundle.py --nolint applications/Tools/pocket_cvss/ manifest.yml bundle.zip

AI usage disclosure (Fill this out):

• Partially AI assisted (clarify below which code was AI assisted and briefly explain what it does).
• Fully AI generated (explain what all the generated code does in moderate detail).

Explanation

• The Pocket CVSS source was generated with AI under my direction and review.
• The app separates CVSS scoring logic from the Flipper UI.
• Standalone C tests cover the CVSS logic.
• CI runs tests, format/lint checks, and uFBT release-channel builds.
• GitHub Actions are pinned, and workflows use minimal permissions.

Reviewer Checklist (Don't fill this out!)

• Bundle is valid
• There are no obvious issues with the source code
• I've ran this application and verified its functionality

[vavkamil]

Hi, what is the current policy on fully AI-generated code?
I don't know any C, but I tried my best to create something useful for myself and possibly others.

[xMasterX]

Current policy is: If app fully works, and does something useful, we can accept that, if its something like AI made "hello world" then no no

[xMasterX]

Be aware that in your latest changelog you used ` symbol, this is not allowed in catalog .md formatting
[E] Markdown error: Markdown element 'Backtick' is not allowed