docs: review and fill gaps for v0.4.7 release

[bonzo81]

Summary

Reviews and fills gaps in the user documentation ahead of the v0.4.7 release, and brings the root README.md and docs/README.md back into sync. Documentation only — no code changes.

Motivation / Problem

What issue does this solve?

• Maintenance / cleanup

Ahead of v0.4.7 the docs had several gaps relative to merged features:

• The Module Sync and Mapping Rules guides existed on disk but were not in site navigation (mkdocs nav / SUMMARY.md), so they were unreachable from the menu.
• The new opt-in Set Primary IP toggle (PR feat: set primary IP action #303) was undocumented.
• The public predict_module_interface_names signal (PR Feat/module interface name predict hook #298) had no developer documentation.
• Module-interface adoption during Module Sync (PR Follow up module sync interface matching and update logic #296) was not described.
• The root and docs READMEs had drifted out of sync.

Scope of Change

• Web UI / templates (docs content only)
• Docs only

How Was This Tested?

• Unit tests: no — documentation-only change
• Manual testing: yes — verified all new navigation entries and cross-links resolve to existing files, and compared the feature subsection headings between README.md and docs/README.md for parity

Manual Test Steps (if applicable)

1. Confirmed docs/usage_tips/module_sync.md, docs/usage_tips/mapping_rules.md, and docs/development/extension_points.md are referenced from both mkdocs.yml and docs/SUMMARY.md.
2. Verified every linked file/target exists in the repo.
3. Diffed the ### feature headings of both READMEs to confirm they match.

Note: a full mkdocs build --strict could not be run in this environment (missing include-markdown plugin and no pip), so a strict build is recommended in the normal docs environment as a final check.

Risk Assessment

• Does this change affect existing users? No — documentation only.
• Could this cause unintended imports / updates? No.

Backwards Compatibility

• No breaking changes

Other Notes

• New page: docs/development/extension_points.md documenting the predict_module_interface_names signal and the VC normalization report.
• Navigation updated in both mkdocs.yml and docs/SUMMARY.md.
• The version bump and 0.4.7 changelog entry are intentionally not included here and can be done as part of the release step.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 5412ff2f-6b18-43a3-9b22-f5580473292a

📥 Commits

Reviewing files that changed from the base of the PR and between 09afc89 and b324e3a.

📒 Files selected for processing (8)

• README.md
• docs/README.md
• docs/SUMMARY.md
• docs/development/README.md
• docs/development/extension_points.md
• docs/feature_list.md
• docs/usage_tips/module_sync.md
• mkdocs.yml

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Walkthrough

This pull request updates plugin documentation across eight files. The primary changes introduce user-facing descriptions for sync feature enhancements (Device Import hardware filtering, Module/Inventory Sync, Device Field Sync with platform mappings, IP Address Sync with optional Set Primary IP toggle, and Multi LibreNMS Server Configuration), along with new developer documentation for the predict_module_interface_names extension signal contract. A technical guide explains module interface template reconciliation during installation, and navigation updates in MkDocs configuration and SUMMARY index the new documentation pages.

Possibly related PRs

• bonzo81/netbox-librenms-plugin#298: The extension points and module interfaces documentation in this PR directly describes the predict_module_interface_names signal contract introduced in that PR.
• bonzo81/netbox-librenms-plugin#288: Both PRs update overlapping documentation sections around Module/Inventory Sync and Device Field Sync, including references to platform mappings and mapping rules guides.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change—a documentation review and gap-filling for the v0.4.7 release.
Description check	✅ Passed	The pull request description comprehensively covers all template sections: Summary, Motivation/Problem, Scope of Change, How Was This Tested (with manual test steps), Risk Assessment, Backwards Compatibility, and Other Notes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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