docs: add --create-pr, --base, and --debug flags to CLI reference

[Kakashi15-pix]

What changed and why

Adds the three CLI flags (--create-pr, --base <branch>, --debug) that
appear in cve-lite --help but were missing from the CLI reference docs.
Descriptions are worded to match the help strings in src/cli/help.ts
(lines 45-50), and each row follows the existing table format with a
default value and example command.

Verified npm run build completes with no broken-link errors and the
new rows render correctly in the CLI reference page.

Closes #993

[sonukapoor]

Thanks for this, and the descriptions themselves are accurate. A few table things before it goes in:

• The --batch-size row above lost its trailing | (and the blank line after it) in this diff. Let's leave that row untouched and just add the new rows below it.
• On the new rows: the --base description repeats "(default:'main')", which the Default column already shows, so we can drop that; gh reads better as `gh` than in single quotes; there's a double space in "Base branch for"; and a couple of trailing spaces to trim.
• Minor: a less arbitrary example than developer_test, maybe develop.

Content is spot on, just tidy the table and it's good to go.