Add data source viewer back

Author: phrocker

api/src/main/java/io/sentrius/sso/controllers/view/DocumentViewController.java

@@ -0,0 +1,48 @@
+package io.sentrius.sso.controllers.view;
+
+import io.sentrius.sso.core.config.SystemOptions;
+import io.sentrius.sso.core.controllers.BaseController;
+import io.sentrius.sso.core.services.ErrorOutputService;
+import io.sentrius.sso.core.services.UserService;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+/**
+ * View controller for data source management UI.
+ * Provides data source search, retrieval, and visualization functionality
+ * for documents, PDFs, wikis, and other data sources.
+ */
+@Slf4j
+@Controller
+@RequestMapping("/sso/v1/data")
+public class DocumentViewController extends BaseController {
+
+    public DocumentViewController(
+        UserService userService,
+        SystemOptions systemOptions,
+        ErrorOutputService errorOutputService
+    ) {
+        super(userService, systemOptions, errorOutputService);
+    }
+
+    /**
+     * Display the data sources page with search and browse capabilities.
+     * Accessible to all authenticated users.
+     */
+    @GetMapping("/sources")
+    public String dataSources(Model model) {
+        log.info("Rendering data sources page");
+        return "sso/data/sources";
+    }
+    
+    /**
+     * Legacy redirect from old documents path
+     */
+    @GetMapping("/documents")
+    public String documentsRedirect(Model model) {
+        return "redirect:/sso/v1/data/sources";
+    }
+}

api/src/main/resources/templates/fragments/sidebar.html

@@ -78,6 +78,21 @@
                 </ul>
             </li>
 
+            <!-- Data Section -->
+            <li class="nav-item mt-2" data-ui-resource="data">
+                <a href="#dataSubmenu" data-bs-toggle="collapse" class="nav-link px-0 align-middle">
+                    <i class="fas fa-database"></i> <span class="ms-1 d-none d-sm-inline">Data</span>
+                    <i class="fas fa-caret-down ms-1 d-none d-sm-inline"></i>
+                </a>
+                <ul class="collapse nav flex-column ms-3" id="dataSubmenu">
+                    <li data-ui-resource="data.sources">
+                        <a href="/sso/v1/data/sources" class="nav-link px-0 align-middle">
+                            <i class="fas fa-database"></i> <span class="ms-1 d-none d-sm-inline">Data Sources</span>
+                        </a>
+                    </li>
+                </ul>
+            </li>
+            
             <!-- AI & Agents Section -->
             <li th:if="${uiAccessHelper.check(operatingUser, 'CAN_MANAGE_USERS', '/ui/ai') || uiAccessHelper.check(operatingUser, 'CAN_MANAGE_APPLICATION', '/ui/ai')}" 
                 class="nav-item mt-2" data-ui-resource="ai">