Added the get document tags API

Marco.Pms.Services/Controllers/DocumentController.cs

@@ -519,6 +519,48 @@ namespace Marco.Pms.Services.Controllers
             // Return the pre-signed URL with a success response
         }
 
+        [HttpGet("get/tags")]
+        public async Task<IActionResult> GetAllDocumentTagsAsync()
+        {
+            // Log: API endpoint execution started
+            _logger.LogInfo("Executing GetAllDocumentTagsAsync to retrieve document tags for tenant.");
+
+            // Immediately create DbContext asynchronously using the factory pattern for efficiency and DI compliance
+            await using var context = await _dbContextFactory.CreateDbContextAsync();
+
+            // Create a new DI scope for scoped services (e.g., user/context-specific dependencies)
+            using var scope = _serviceScope.CreateScope();
+
+            try
+            {
+                // Fetch the currently logged-in employee (auth/user context)
+                var loggedInEmployee = await _userHelper.GetCurrentEmployeeAsync();
+                if (loggedInEmployee == null)
+                {
+                    _logger.LogWarning("Current employee could not be identified.");
+                    return Unauthorized(ApiResponse<object>.ErrorResponse("Unauthorized", 401));
+                }
+
+                // Retrieve the tags that belong to the specified tenant and project only the names (performance: projection)
+                var tags = await context.DocumentTagMasters
+                    .Where(dt => dt.TenantId == tenantId)
+                    .Select(dt => dt.Name)
+                    .ToListAsync();
+
+                _logger.LogInfo("Successfully retrieved {TagCount} document tags for tenant {TenantId}.", tags.Count, tenantId);
+
+                // Return tags wrapped in ApiResponse object
+                return Ok(ApiResponse<object>.SuccessResponse(tags, "Tags fetched successfully", 200));
+            }
+            catch (Exception ex)
+            {
+                // Log: Unexpected error handling
+                _logger.LogError(ex, "Error occurred while retrieving document tags for tenant {TenantId}.", tenantId);
+                return StatusCode(500, ApiResponse<object>.ErrorResponse("An error occurred while fetching tags.", 500));
+            }
+        }
+
+
         /// <summary>
         /// Uploads a document attachment for an Employee or Project.
         /// Validates permissions, document type, entity existence, tags, and uploads to S3.