Add external import sources, work history, screening fields and Phase 1 docs

- New ExternalImportSource and ExternalWorkHistoryEntry models, controller and migrations
- Screening fields on external profile imports
- Admin and provider profile views, routes and workflow tests updated
- Phase 1 validation, route inventory, gap report template and roadmap docs
- Add the Google Sheets work-order parser tool (tools/google-sheets-wo-parser)

config/provider-exchange.php

@@ -10,4 +10,13 @@ return [
             explode(',', env('TSE_ATTACHMENT_MIME_TYPES', 'image/jpeg,image/png,image/webp,application/pdf,text/plain,text/csv,application/zip'))
         ))),
     ],
+    'import_sources' => [
+        'disk' => env('TSE_IMPORT_SOURCE_DISK', 'local'),
+        'root' => trim(env('TSE_IMPORT_SOURCE_ROOT', 'external-import-sources'), '/'),
+        'max_kb' => (int) env('TSE_IMPORT_SOURCE_MAX_KB', 51200),
+        'allowed_mime_types' => array_values(array_filter(array_map(
+            'trim',
+            explode(',', env('TSE_IMPORT_SOURCE_MIME_TYPES', 'image/jpeg,image/png,image/webp,application/pdf,text/plain,text/csv,application/json,text/html,application/zip'))
+        ))),
+    ],
 ];