feat(display): improve NAT rule directionality presentation in markdown reports

[unclesp1d3r]

Summary

• Add BuildOutboundNATTable and BuildInboundNATTable methods to MarkdownBuilder for clear visual separation of NAT rule types
• Update BuildSecuritySection to use new NAT table builders with direction indicators (⬆️ Outbound / ⬇️ Inbound)
• Add inbound rules count to NAT summary and security warning for port forwarding exposure
• Update all templates (opnsense_report.md.tmpl, opnsense_report_comprehensive.md.tmpl, reports/standard.md.tmpl) to properly iterate over inbound NAT rules

Test plan

• Verified with just ci-check - all tests pass
• Added unit tests for BuildOutboundNATTable (with rules, empty rules, special characters)
• Added unit tests for BuildInboundNATTable (with rules, empty rules, special characters)
• Added unit tests for BuildSecuritySection with both NAT types and security warnings

Closes #60

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[coderabbitai]

Caution

Review failed

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📝 Walkthrough

Summary by CodeRabbit

• New Features
  • Reorganized NAT sections with dedicated Outbound (Source Translation) and Inbound (Port Forwarding) tables.
  • Added direction indicators to distinguish NAT rule types in reports.
  • Enhanced inbound NAT display with external port, target IP, and priority columns.
  • Added security warnings for inbound NAT configurations.

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Walkthrough

This PR enhances NAT rule presentation in markdown reports by implementing dedicated outbound and inbound NAT table builders with direction indicators, security warnings, and template integration for clear traffic flow visualization.

Changes

Cohort / File(s)	Summary
NAT Table Builders internal/converter/markdown.go	Added BuildOutboundNATTable() and BuildInboundNATTable() helper functions that generate formatted markdown tables with field escaping, protocol/status defaults, and interface link formatting. Integrated both helpers into Security section rendering; updated NAT Summary display to include inbound rule counts and dynamic mode resolution from available sources.
NAT Table Tests internal/converter/markdown_builder_test.go	Added 6 new test functions covering outbound and inbound NAT table generation (with rules, empty rules, special characters) plus 4 integration tests for NAT sections within Security output (both NAT types present, inbound warnings, NAT reflection). Introduced comprehensive test data builders (createComprehensiveTestData) for representative configuration structures.
Report Templates internal/templates/opnsense_report.md.tmpl, internal/templates/opnsense_report_comprehensive.md.tmpl, internal/templates/reports/standard.md.tmpl	Renamed "Outbound NAT Rules" to "Outbound NAT (Source Translation)" with added Direction column (⬆️ Outbound). Added new "Inbound NAT (Port Forwarding)" section with Direction column (⬇️ Inbound), External Port, Target IP, Target Port, and Priority columns. Introduced security warning block for inbound NAT exposure; removed Created By columns; updated empty-state messaging.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• PR #110: Extends converter/markdown builder test infrastructure and data builders used in this PR's new test coverage
• PR #72: Modifies NAT-related markdown rendering in identical files (markdown.go, templates) with overlapping table presentation logic
• PR #77: Adds/expands NATSummary and NAT configuration reporting structures that complement this PR's table builders and template rendering

Suggested labels

type:feature, go, testing, priority:normal

Poem

🔀 Outbound flows in arrows bright,
Inbound welcomes foreign light,
Tables clear the muddy waters—
⬆️ and ⬇️ guide the data's daughters!
Security warnings light the way,
NAT rules now have their say! 🎯

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 11.11% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	Title follows conventional commit format with 'feat' type and clear scope describing NAT directionality improvements in markdown reports.
Description check	✅ Passed	Description covers implementation details, testing (unit tests and ci-check verification), and provides a clear summary of changes across multiple files and templates.
Linked Issues check	✅ Passed	All coding requirements from issue #60 are met: BuildOutboundNATTable and BuildInboundNATTable methods implemented, direction indicators added, security warnings included, templates updated to iterate inbound/outbound rules.
Out of Scope Changes check	✅ Passed	All changes are focused on issue #60 objectives: NAT table builders, security section updates, template modifications, and comprehensive unit test coverage for NAT rendering.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch 60-improve-nat-rule-directionality-presentation-in-markdown-reports

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[Copilot]

Pull request overview

This pull request improves the presentation of NAT rules in markdown reports by introducing clear visual directionality indicators and separating inbound/outbound NAT rules into dedicated sections.

Changes:

• Added BuildOutboundNATTable and BuildInboundNATTable methods to MarkdownBuilder for programmatic generation of NAT rule tables with direction indicators (⬆️ Outbound / ⬇️ Inbound)
• Updated BuildSecuritySection to use the new table builders and include inbound rules count in the NAT summary
• Added security warnings for port forwarding configurations that increase attack surface
• Updated all templates to properly iterate over inbound NAT rules and display them with consistent formatting

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
internal/converter/markdown.go	Added BuildOutboundNATTable and BuildInboundNATTable methods with proper escaping, status formatting, and direction indicators; updated BuildSecuritySection to use new builders and include inbound rules count
internal/converter/markdown_builder_test.go	Added comprehensive unit tests for new NAT table builders covering rules with data, empty rules, special characters, and security warnings
internal/templates/reports/standard.md.tmpl	Updated NAT sections with direction indicators, proper iteration over inbound rules, and security warnings
internal/templates/opnsense_report_comprehensive.md.tmpl	Updated NAT sections with direction indicators, proper iteration over inbound rules, and security warnings
internal/templates/opnsense_report.md.tmpl	Updated NAT sections with direction indicators, proper iteration over inbound rules, inbound count in summary, and security warnings

[codecov]

Codecov Report

❌ Patch coverage is 94.64286% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
internal/converter/markdown.go	94.64%	3 Missing and 3 partials ⚠️

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