rebrand: rename project from Dispensa Manager to EverShelf

- Update app name across all files (manifest, index.html, README, docs)
- Update contact email to evershelfproject@gmail.com
- Rename Docker service/container/volume to evershelf
- Rename localStorage keys: dispensa_* → evershelf_*
- Rename SQLite DB reference: dispensa.db → evershelf.db
- Update SSH remote to dadaloop82/EverShelf
- Update Apache conf file name to evershelf.conf
- Update CI workflow Docker image/container names
- Update cron job example path
- Add data/dispensa.db to .gitignore to prevent accidental commit

api/database.php

@@ -1,13 +1,13 @@
 <?php
 /**
- * Dispensa Manager - Database initialization, schema, and migrations.
+ * EverShelf - Database initialization, schema, and migrations.
  * Uses SQLite with WAL journal mode for concurrent read/write performance.
  *
- * @author Stimpfl Daniel <dadaloop82@gmail.com>
+ * @author Stimpfl Daniel <evershelfproject@gmail.com>
  * @license MIT
  */
 
-define('DB_PATH', __DIR__ . '/../data/dispensa.db');
+define('DB_PATH', __DIR__ . '/../data/evershelf.db');
 
 function getDB(): PDO {
     $isNew = !file_exists(DB_PATH);