Prepare for public distribution v1.0.0

- Remove all personal data from source code (HA IP, JWT tokens)
- Move secrets to .env configuration (gitignored)
- Create .env.example template for new installations
- Add centralized env() helper, eliminate code duplication (~120 lines removed)
- Add input validation on inventory operations (quantity bounds, location whitelist)
- Remove sensitive credential exposure in API responses
- Remove database and runtime files from Git tracking
- Disable database push-to-GitHub backup (local-only backup now)
- Update .gitignore for distribution
- Add comprehensive README with installation guide
- Add CHANGELOG.md for version tracking
- Add MIT LICENSE
- Add author/license headers to all source files
- TTS defaults now empty (configured per-installation via .env)

api/database.php

@@ -1,6 +1,10 @@
 <?php
 /**
- * Database initialization and connection for Dispensa Manager
+ * Dispensa Manager - Database initialization, schema, and migrations.
+ * Uses SQLite with WAL journal mode for concurrent read/write performance.
+ *
+ * @author Stimpfl Daniel <dadaloop82@gmail.com>
+ * @license MIT
  */
 
 define('DB_PATH', __DIR__ . '/../data/dispensa.db');