feat: Enhance file search with core plugin and Omnisearch integration

- Introduces a new match_search_files tool for fuzzy/keyword search, integrating with Obsidian's core search plugin and updating Omnisearch integration for improved file search capabilities.
- Adds settings for selecting search backends (core plugin, Omnisearch, ripgrep) for both regex and match searches.
- Updates language files, prompts, and types to support the new functionality.
- Restructures search-related files for better organization.

src/types/settings.ts

@@ -260,8 +260,9 @@ export const InfioSettingsSchema = z.object({
 	jinaApiKey: z.string().catch(''),
 
 	// Files Search
-	filesSearchMethod: z.enum(['regex', 'semantic', 'auto']).catch('auto'),
-	regexSearchBackend: z.enum(['omnisearch', 'ripgrep']).catch('ripgrep'),
+	filesSearchMethod: z.enum(['match', 'regex', 'semantic', 'auto']).catch('auto'),
+	regexSearchBackend: z.enum(['coreplugin', 'ripgrep']).catch('ripgrep'),
+	matchSearchBackend: z.enum(['omnisearch', 'coreplugin']).catch('coreplugin'),
 	ripgrepPath: z.string().catch(''),
 
 	/// [compatible]