Fix backend search and remove dead code

Critical fixes from code review:
- Add missing @QueryParam("q") String query parameter to LearningResourceResource.list()
- Pass query parameter to filter so backend search actually works
- Remove dead code: pageCondition() and categoryCondition() methods (replaced by pageIdsCondition and categoriesCondition)

Backend search was previously broken - the frontend sent 'q' parameter but backend never declared or used it, silently ignoring all search requests.

Co-authored-by: Copilot <Copilot@users.noreply.github.com>

Author: gitar-bot

openmetadata-service/src/main/java/org/openmetadata/service/jdbi3/LearningResourceRepository.java

@@ -288,18 +288,6 @@ private String jsonColumn(String tableName) {
       return tableName == null ? "json" : tableName + ".json";
     }
 
-    private String pageCondition(String tableName) {
-      String column = jsonColumn(tableName);
-      if (Boolean.TRUE.equals(DatasourceConfig.getInstance().isMySQL())) {
-        return String.format(
-            "JSON_SEARCH(%s, 'one', :pageId, NULL, '$.contexts[*].pageId') IS NOT NULL", column);
-      }
-      return String.format(
-          "EXISTS (SELECT 1 FROM jsonb_array_elements(COALESCE(%s->'contexts', '[]'::jsonb)) ctx"
-              + " WHERE ctx->>'pageId' = :pageId)",
-          column);
-    }
-
     private String componentCondition(String tableName) {
       String column = jsonColumn(tableName);
       if (Boolean.TRUE.equals(DatasourceConfig.getInstance().isMySQL())) {
@@ -313,18 +301,6 @@ private String componentCondition(String tableName) {
           column);
     }
 
-    private String categoryCondition(String tableName) {
-      String column = jsonColumn(tableName);
-      if (Boolean.TRUE.equals(DatasourceConfig.getInstance().isMySQL())) {
-        return String.format(
-            "JSON_SEARCH(%s, 'one', :category, NULL, '$.categories') IS NOT NULL", column);
-      }
-      return String.format(
-          "EXISTS (SELECT 1 FROM jsonb_array_elements_text(COALESCE(%s->'categories', '[]'::jsonb)) cat"
-              + " WHERE cat = :category)",
-          column);
-    }
-
       private String difficultyCondition(String tableName) {
         String column = jsonColumn(tableName);
         if (Boolean.TRUE.equals(DatasourceConfig.getInstance().isMySQL())) {

openmetadata-service/src/main/java/org/openmetadata/service/resources/learning/LearningResourceResource.java

@@ -128,17 +128,22 @@ public ResultList<LearningResource> list(
       @Parameter(description = "Returns list of learning resources after this cursor")
           @QueryParam("after")
           String after,
-      @Parameter(
-              description = "Include all, deleted, or non-deleted entities",
-              schema = @Schema(implementation = Include.class))
-          @QueryParam("include")
-          @DefaultValue("non-deleted")
-          Include include,
         @Parameter(
-                description = "Filter resources to specific page identifiers (supports multiple values)",
-                schema = @Schema(type = "array"))
-            @QueryParam("pageId")
-            List<String> pageIds,
+                description = "Include all, deleted, or non-deleted entities",
+                schema = @Schema(implementation = Include.class))
+            @QueryParam("include")
+            @DefaultValue("non-deleted")
+            Include include,
+        @Parameter(
+                description = "Search query for text search across name, displayName, and description",
+                schema = @Schema(type = "string"))
+            @QueryParam("q")
+            String query,
+          @Parameter(
+                  description = "Filter resources to specific page identifiers (supports multiple values)",
+                  schema = @Schema(type = "array"))
+              @QueryParam("pageId")
+              List<String> pageIds,
         @Parameter(
                 description = "Filter by component identifier within a page",
                 schema = @Schema(type = "string"))
@@ -166,6 +171,9 @@ public ResultList<LearningResource> list(
             List<String> statuses) {
     LearningResourceRepository.LearningResourceFilter filter =
         new LearningResourceRepository.LearningResourceFilter(include);
+    if (query != null && !query.isEmpty()) {
+      filter.addQueryParam("q", query);
+    }
     if (pageIds != null && !pageIds.isEmpty()) {
       filter.addQueryParam("pageIds", pageIds);
     }