docs(cli-reference): document ocr scan flags

[woandzym-stack]

Description

Adds a dedicated ## ocr scan section to the CLI reference (en + zh),
documenting the three most commonly used scan flags: --path, --exclude,
and --preview.

Previously ocr scan only had a single row in the command summary table —
no flag reference and no usage examples. Users had no documented way to
scope a scan to specific paths, exclude generated files, or preview the
scan range without calling the LLM.

The section includes:

• A short synopsis and the default behavior (whole-repo scan when no
  --path is given).
• A flags table with defaults and descriptions for --path, --exclude,
  and --preview.
• Usage examples.
• A pointer to ocr scan -h for the full flag list, so the three documented flags
  aren't mistaken for the complete set.

Both en and zh are updated in sync. No source code or README changes.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Refactoring (no functional changes)
• Documentation update
• CI / Build / Tooling

How Has This Been Tested?

• make test passes locally
• Manual testing (describe below)

Documentation only — no code changes. Verified every flag, default, and
behavior against the source:

• Flag defaults/descriptions: cmd/opencodereview/shared_flags.go
  (registerScanFlags)
• --preview output (file list, reviewable/excluded counts, total lines,
  exclusion reasons): internal/scan/preview.go
• Template defaults: internal/config/template/scan_template.json

Checklist

• My code follows the project's coding style (go fmt, go vet) — N/A, docs only
• I have performed a self-review of my code
• I have added tests that prove my fix is effective or my feature works — N/A, docs only
• New and existing unit tests pass locally with my changes — N/A, docs only
• I have updated the documentation accordingly (if applicable)
• I have signed the CLA — will sign when the CLA bot prompts

Related Issues

None

[github-actions]

✅ OpenCodeReview: Review skipped: no items were selected.

[lizhengfeng101]

Thanks for adding the ocr scan section — the flag documentation is accurate and the examples are helpful.

A couple of minor suggestions:

1. ja/ru localization: The cli-reference docs exist in four languages (en, zh, ja, ru). This PR covers en and zh — could you add the equivalent section to ja and ru as well for consistency? (Or open a follow-up issue if you'd prefer.)

2. Chinese typography (zh): The line LLM 评审--适合审计陌生代码库 uses -- which may be confused with a CLI flag. Consider replacing with an em-dash —— or spacing it out.

3. English dash style (en, minor): sent to the LLM - useful for auditing — a spaced em-dash (—) or unspaced em-dash (—) would be more conventional.

Otherwise LGTM — the flags match the source in shared_flags.go and the ocr scan -h pointer at the end is a nice touch.

[CLAassistant]

All committers have signed the CLA.

[woandzym-stack]

Thanks for the review! All three suggestions addressed:

• ja/ru localization: added the equivalent ocr scan section to both
  ja/cli-reference.md and ru/cli-reference.md.
• zh typography: replaced -- with an em-dash in the scan description.
• en dash style: replaced the spaced hyphen with a spaced em-dash in the
  scan description.

[wu21-web]

Thanks. The documentation is clear, just one issue here:

[lizhengfeng101]

LGTM