Merge Advisor results into ImpactedResources sheet

## Summary

Merge Azure Advisor scan results into the unified `ImpactedResources` sheet (with "Recommendation Source" == "Azure Advisor") instead of rendering them in a separate "Advisor" sheet/section.

## Requirements

- Advisor results appear in ImpactedResources with proper category mapping
- Advisor takes precedence when duplicates exist (same resource + same recommendation)
- Advisor recommendations also appear in the Recommendations sheet
- Remove separate Advisor sheet from Excel output
- Remove separate Advisor sections from CSV and JSON renderers
- Update web viewer to remove Advisor page, menu item, and related UI elements

## Motivation

Having Advisor results in a separate sheet makes it harder to get a unified view of all recommendations affecting a resource. Merging them simplifies the report structure and provides a single place to review all findings.