feat: Enhance Manticore integration and AI model support

- Added support for specifying vector dimensions in AI payloads for compatible vendors.
- Updated default AI model from 'text-embedding-ada-002' to 'text-embedding-3-small'.
- Refactored ManticoreBase to bind parameters explicitly for PDO statements, improving type handling.
- Adjusted SQL queries across Manticore modules to remove content previews and ensure inline vector values.
- Updated content preview handling in ManticoreFile, ManticoreProject, ManticoreTask, and ManticoreUser to use substrings for better data management.

app/Module/Manticore/ManticoreFile.php

@@ -165,7 +165,7 @@ class ManticoreFile
                 'type' => $item['file_type'],
                 'ext' => $item['file_ext'],
                 'userid' => $item['userid'],
-                'content_preview' => $item['content_preview'] ?? null,
+                'content_preview' => isset($item['content']) ? mb_substr($item['content'], 0, 500) : null,
                 'relevance' => $item['relevance'] ?? $item['similarity'] ?? $item['rrf_score'] ?? 0,
             ];
         }