fix: configure SQLite WAL mode and busy_timeout to prevent database locked errors

- Enable WAL journal mode for concurrent read/write support
- Set busy_timeout to 30s to wait on locks instead of failing immediately
- Set synchronous to normal for better write performance

Fixes #770

config/database.php

@@ -41,6 +41,9 @@ return [
             'database' => env('DB_DATABASE') ? base_path(env('DB_DATABASE')) : database_path('database.sqlite'),
             'prefix' => '',
             'foreign_key_constraints' => env('DB_FOREIGN_KEYS', true),
+            'busy_timeout' => env('DB_BUSY_TIMEOUT', 30000),
+            'journal_mode' => env('DB_JOURNAL_MODE', 'wal'),
+            'synchronous' => env('DB_SYNCHRONOUS', 'normal'),
         ],
 
         'mysql' => [