Fix Solr configuration and verify all services

- Add stopwords.txt and synonyms.txt for Solr
- Remove unsupported handlers from solrconfig.xml for Solr 9.x
- Add comprehensive test suite for all backend services
- Verify all 15 containers are running properly
- All services pass health checks successfully

🤖 Generated with [Claude Code](https://claude.ai/code)

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

services/search/solr-config/conf/solrconfig.xml

@@ -146,9 +146,7 @@
     </lst>
   </requestHandler>
   
-  <!-- Schema handler -->
-  <requestHandler name="/schema" class="solr.SchemaHandler"/>
+  <!-- Schema handler (removed for Solr 9.x compatibility) -->
   
-  <!-- Config handler -->
-  <requestHandler name="/config" class="solr.ConfigHandler"/>
+  <!-- Config handler (removed for Solr 9.x compatibility) -->
 </config>