feat(search): add Ollama and rate-limit config properties

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

backend/src/main/resources/application.yaml

@@ -130,6 +130,16 @@ app:
     # The loader maps columns by header name — no positional indices (see ADR-025).
     dir: ${IMPORT_DIR:/import}
 
+  ollama:
+    base-url: http://ollama:11434
+    model: qwen2.5:7b-instruct-q4_K_M
+    timeout-seconds: 30
+    health-check-timeout-seconds: 2
+
+  nl-search:
+    rate-limit:
+      max-requests-per-minute: 5
+
 ocr:
   sender-model:
     activation-threshold: 100