feat: show log indices on OpenSearch admin page

Add prefix query parameter to /admin/opensearch/indices endpoint so
the UI can fetch execution and log indices separately. OpenSearch admin
page now shows two card sections: Execution Indices and Log Indices,
each with doc count and size summary. Page restyled with CSS module
replacing inline styles. Delete endpoint also allows log index deletion.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cameleer3-server-app/src/main/java/com/cameleer3/server/app/controller/OpenSearchAdminController.java

@@ -49,12 +49,14 @@ public class OpenSearchAdminController {
     private final ObjectMapper objectMapper;
     private final String opensearchUrl;
     private final String indexPrefix;
+    private final String logIndexPrefix;
 
     public OpenSearchAdminController(OpenSearchClient client, RestClient restClient,
                                       SearchIndexerStats indexerStats, AuditService auditService,
                                       ObjectMapper objectMapper,
                                       @Value("${opensearch.url:http://localhost:9200}") String opensearchUrl,
-                                      @Value("${opensearch.index-prefix:executions-}") String indexPrefix) {
+                                      @Value("${opensearch.index-prefix:executions-}") String indexPrefix,
+                                      @Value("${opensearch.log-index-prefix:logs-}") String logIndexPrefix) {
         this.client = client;
         this.restClient = restClient;
         this.indexerStats = indexerStats;
@@ -62,6 +64,7 @@ public class OpenSearchAdminController {
         this.objectMapper = objectMapper;
         this.opensearchUrl = opensearchUrl;
         this.indexPrefix = indexPrefix;
+        this.logIndexPrefix = logIndexPrefix;
     }
 
     @GetMapping("/status")
@@ -100,7 +103,8 @@ public class OpenSearchAdminController {
     public ResponseEntity<IndicesPageResponse> getIndices(
             @RequestParam(defaultValue = "0") int page,
             @RequestParam(defaultValue = "20") int size,
-            @RequestParam(defaultValue = "") String search) {
+            @RequestParam(defaultValue = "") String search,
+            @RequestParam(defaultValue = "executions") String prefix) {
         try {
             Response response = restClient.performRequest(
                     new Request("GET", "/_cat/indices?format=json&h=index,health,docs.count,store.size,pri,rep&bytes=b"));
@@ -109,10 +113,12 @@ public class OpenSearchAdminController {
                 indices = objectMapper.readTree(is);
             }
 
+            String filterPrefix = "logs".equals(prefix) ? logIndexPrefix : indexPrefix;
+
             List<IndexInfoResponse> allIndices = new ArrayList<>();
             for (JsonNode idx : indices) {
                 String name = idx.path("index").asText("");
-                if (!name.startsWith(indexPrefix)) {
+                if (!name.startsWith(filterPrefix)) {
                     continue;
                 }
                 if (!search.isEmpty() && !name.contains(search)) {
@@ -152,7 +158,7 @@ public class OpenSearchAdminController {
     @Operation(summary = "Delete an OpenSearch index")
     public ResponseEntity<Void> deleteIndex(@PathVariable String name, HttpServletRequest request) {
         try {
-            if (!name.startsWith(indexPrefix)) {
+            if (!name.startsWith(indexPrefix) && !name.startsWith(logIndexPrefix)) {
                 throw new ResponseStatusException(HttpStatus.FORBIDDEN, "Cannot delete index outside application scope");
             }
             boolean exists = client.indices().exists(r -> r.index(name)).value();