Add platform powder catalog management UI with full CRUD and AI lookup

- PowderCatalogController: Create, Edit, ToggleDiscontinued actions; searchable/filterable/sortable Index with pagination; AiLookup and AiAugmentFromUrl endpoints backed by IInventoryAiLookupService
- New views: Create, Edit, _Form partial (with AI-assisted field population), overhauled Index grid with completeness quality badges and responsive mobile cards
- New ViewModels: PowderCatalogIndexViewModel, PowderCatalogFormViewModel, PowderCatalogListItemViewModel
- AI lookup improvements: SpecificGravity field added to InventoryAiLookupResult; ApplyPowderFallbacks derives CoverageSqFtPerLb from specific gravity when docs omit it; DefaultTransferEfficiency (65%) applied everywhere transfer efficiency is null
- powder-catalog-ai-lookup.js: client-side AI lookup and URL augment wiring for the catalog form

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.claude/settings.local.json

@@ -171,7 +171,8 @@
       "PowerShell(Select-String *)",
       "Bash(Select-Object -First 20)",
       "PowerShell(node -e \"require\\('fs'\\).existsSync\\(require\\('path'\\).join\\(process.cwd\\(\\), 'node_modules', 'sharp'\\)\\) ? console.log\\('sharp ok'\\) : console.log\\('no sharp'\\)\")",
-      "WebFetch(domain:www.powdercoatinglogix.com)"
+      "WebFetch(domain:www.powdercoatinglogix.com)",
+      "PowerShell($bytes = [System.IO.File]::ReadAllBytes\\('src/PowderCoating.Web/Views/Jobs/Details.cshtml'\\); $text = [System.Text.Encoding]::UTF8.GetString\\($bytes\\); $idx = $text.IndexOf\\('hasPowderData'\\); $snippet = $text.Substring\\($idx - 20, 250\\); [System.Text.Encoding]::Unicode.GetBytes\\($snippet\\) | Format-Hex | Select-Object -First 30)"
     ]
   }
 }