feat(inventory): modules/inventory sync tab with mapping rules

[marcinpsk]

Add inventory/modules sync functionality:

• Six mapping model types: DeviceTypeMapping, ModuleTypeMapping, ModuleBayMapping, NormalizationRule, InventoryIgnoreRule, PlatformMapping
• Migration 0010 creating all mapping tables
• Modules sync tab on Device/VM detail pages with ENTITY-MIB inventory data
• Install, replace, and move module actions
• Mapping CRUD views with YAML bulk export for all mapping models
• LibreNMS API: get_device_transceivers() for transceiver data
• Platform matching: PlatformMapping lookup before name-exact match
• contrib/ YAML files with example mappings and rules
• Comprehensive test coverage (test_sync_modules, test_modules_view, test_module_replace, test_platform_mapping, test_tables_modules)

Summary

Briefly describe what this PR does in plain English, and provide as much of the following information as possible.

Motivation / Problem

What issue does this solve?

• Bug
• Feature
• Refactor
• Maintenance / cleanup

Link any related issues if applicable.

Scope of Change

Delete items that don’t apply:

• Sync/Import logic
• NetBox models / ORM
• LibreNMS API interaction
• Config / settings
• Web UI / templates
• Database migrations
• Tests
• Docs only
• Other:

How Was This Tested?

Delete items that don’t apply and describe briefly.

• Unit tests: <yes/no + what>
• Manual testing: <yes/no + what>
• Not tested:

Manual Test Steps (if applicable)

Risk Assessment

• Does this change affect existing users?
• Could this cause unintended imports / updates?

Explain briefly.

Backwards Compatibility

• No breaking changes
• Breaking change (explain and document)

Other Notes

Anything the maintainer(s) should pay particular attention to?

Summary by CodeRabbit

• New Features

  • Module Sync tab with merged inventory, install/branch install, serial update, replace/move, mismatch preview; new mapping management UIs and bulk YAML import/export plus example YAMLs.

• Bug Fixes

  • Improved virtual‑chassis detection, clearer platform-ambiguity messages, safer regex/normalization handling, preserved role availability during imports, and more robust modal/HTMX fetch/error handling.

• Documentation

  • Added contrib README with example YAML mapping files; updated testing and custom-field guidance.

• Tests

  • Large expansion of unit, integration, and end‑to‑end tests.