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)

index.html

@@ -6,6 +6,8 @@
     <meta name="apple-mobile-web-app-capable" content="yes">
     <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
     <meta name="theme-color" content="#2d5016">
+    <meta name="author" content="Stimpfl Daniel">
+    <meta name="description" content="Self-hosted pantry manager with barcode scanning, AI identification, and shopping list integration.">
     <title>Dispensa Manager</title>
     <link rel="manifest" href="manifest.json">
     <link rel="icon" type="image/svg+xml" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>🏠</text></svg>">