feat: add non-markdown files to metadata endpoints

- Added support for non-markdown files (images, PDFs, code, etc) in vault metadata endpoints
- Implemented filesystem scanning for non-markdown files with configurable extension whitelist
- Added deduplication by file path to prevent duplicates between Meilisearch and filesystem
- Enhanced folder filtering and kind filtering to properly handle non-markdown files
- Added validation to remove stale entries not present on disk
- Improved logging to track

vault/toto/test/Nouvelle note 2 copy.md

@@ -0,0 +1,22 @@
+---
+titre: Bruno Charest
+auteur: Bruno Charest
+creation_date: 2025-10-24T12:24:03.706Z
+modification_date: 2025-10-24T08:24:04-04:00
+catégorie: ""
+tags:
+  - ""
+aliases:
+  - ""
+status: en-cours
+publish: false
+favoris: false
+template: false
+task: false
+archive: false
+draft: false
+private: false
+readOnly: false
+---
+# TEST
+