docs: missing CLI flags in README

[Mzack9999]

Add six flags that are registered in the CLI but were missing from the README help block (and all locale copies):

• -targets-inline (TARGET)
• -vtt / -vars-text-templating, -vfp / -var-file-paths (TARGET-FORMAT)
• -pe / -pdf-export (OUTPUT)
• -per-host-rate-limit (RATE-LIMIT)
• -preflight-portscan (OPTIMIZATIONS)

Closes #7595

Summary by CodeRabbit

• Documentation
  • Updated CLI help documentation across supported languages.
  • Added guidance for inline multiline targets, variable templating and YAML injection.
  • Documented PDF result export and per-host rate limiting.
  • Added details for optional pre-scan TCP port filtering before scanning.

[coderabbitai]

Walkthrough

The README files now document six CLI flags across target input, variable handling, PDF output, rate limiting, and preflight target filtering sections in English and localized translations.

Changes

CLI help documentation

Layer / File(s)	Summary
Target and variable flags README*.md	Documents inline multiline targets plus variable templating and YAML variable-file injection options.
Output and rate-limit flags README*.md	Documents PDF result export and per-host rate limiting.
Preflight scanning flag README*.md	Documents optional preflight resolution and TCP port scanning before target filtering and scanning.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Poem

I’m a rabbit with docs in my paws,
Adding flags without bugs or applause.
Targets hop in line,
PDFs now shine,
And scans preflight through the claws!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The README updates add all six missing CLI flags across the documented locale files, matching the linked issue requirements.
Out of Scope Changes check	✅ Passed	The changes stay within documentation and localization updates, with no unrelated code or behavior changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: adding missing CLI flags to the README documentation.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 7595-readme-flags

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