refactor: migrate VaultTools link methods to use adapters

Update validateWikilinks, resolveWikilink, and getBacklinks methods
to use IVaultAdapter and IMetadataCacheAdapter instead of direct App access.

- Implemented inline link suggestion finding using vault adapter
- Implemented backlinks retrieval using metadata cache adapter
- Added helper methods: findLinkSuggestions, extractSnippet, escapeRegex
- App parameter still required for waypoint methods (not in scope for this task)

package-lock.json

@@ -1,12 +1,12 @@
 {
 	"name": "obsidian-mcp-server",
-	"version": "1.0.0",
+	"version": "3.0.0",
 	"lockfileVersion": 3,
 	"requires": true,
 	"packages": {
 		"": {
 			"name": "obsidian-mcp-server",
-			"version": "1.0.0",
+			"version": "3.0.0",
 			"license": "MIT",
 			"dependencies": {
 				"cors": "^2.8.5",