feat: add HTTP basic authentication support for monitors (#3033)

## Changes
- Add basicAuthUser and basicAuthPassword fields to Monitor model, types, and validation (server + client)
- Update networkService to send Authorization: Basic header when credentials are provided
- Add basic auth form fields (username/password) to the create/edit monitor page for HTTP monitors
- Add i18n strings for the new basic authentication section

## Benefits
- Users can monitor endpoints protected by HTTP basic authentication
- Credentials are sent as standard Authorization: Basic base64-encoded header
- Basic auth is only used when bearer token (secret) is not configured

server/src/validation/monitorValidation.ts

@@ -70,6 +70,8 @@ export const createMonitorBodyValidation = z.object({
 	jsonPath: z.union([z.string(), z.literal("")]).optional(),
 	expectedValue: z.union([z.string(), z.literal("")]).optional(),
 	matchMethod: z.union([z.string(), z.null(), z.literal("")]).optional(),
+	basicAuthUser: z.union([z.string(), z.literal("")]).optional(),
+	basicAuthPassword: z.union([z.string(), z.literal("")]).optional(),
 	gameId: z.union([z.string(), z.literal("")]).optional(),
 	grpcServiceName: z.union([z.string(), z.literal("")]).default(""),
 	selectedDisks: z.array(z.string()).optional(),
@@ -94,6 +96,8 @@ export const editMonitorBodyValidation = z.object({
 	jsonPath: z.union([z.string(), z.literal("")]).optional(),
 	expectedValue: z.union([z.string(), z.literal("")]).optional(),
 	matchMethod: z.union([z.string(), z.null(), z.literal("")]).optional(),
+	basicAuthUser: z.union([z.string(), z.literal("")]).optional(),
+	basicAuthPassword: z.union([z.string(), z.literal("")]).optional(),
 	port: z.number().min(1).max(65535).optional(),
 	cpuAlertThreshold: z.number().optional(),
 	memoryAlertThreshold: z.number().optional(),