feat: Add Omnisearch support for regex search

This commit introduces the option to use Omnisearch as a backend for the regex search functionality, in addition to the existing ripgrep backend.

src/lang/locale/en.ts

@@ -227,8 +227,12 @@ export default {
 			auto: 'Auto',
 			semantic: 'Semantic',
 			regex: 'Regex',
+			regexBackend: 'Regex search backend',
+			regexBackendDescription: 'Choose the backend for regex search method.',
+			ripgrep: 'ripgrep',
+			omnisearch: 'Omnisearch',
 			ripgrepPath: 'ripgrep path',
-			ripgrepPathDescription: 'Path to the ripgrep binary. When using regex search, this is required.',
+			ripgrepPathDescription: 'Path to the ripgrep binary. When using ripgrep regex search, this is required.',
 		},
 		
 		// Chat Behavior Section

src/lang/locale/zh-cn.ts

@@ -228,8 +228,12 @@ export default {
 			auto: '自动',
 			semantic: '语义',
 			regex: '正则',
+			regexBackend: '正则搜索后端',
+			regexBackendDescription: '选择正则搜索的后端。',
+			ripgrep: 'ripgrep',
+			omnisearch: 'Omnisearch',
 			ripgrepPath: 'ripgrep 路径',
-			ripgrepPathDescription: 'ripgrep 二进制文件的路径。使用正则搜索时需要此项。',
+			ripgrepPathDescription: 'ripgrep 二进制文件的路径。使用 ripgrep 正则搜索时需要此项。',
 		},
 		
 		// 聊天行为部分