Release version 1.0.1

- Add Twig template engine integration
- Migrate all templates to Twig format
- Add German (Switzerland, Informal) translation
- Improve template organization and security
- Add Composer dependency management
- Create comprehensive changelog

templates/admin/package-row.twig

@@ -0,0 +1,36 @@
+{#
+ # Admin Package Row Template
+ #
+ # @package WC_Tier_Package_Prices
+ # @var int index
+ # @var array package
+ #}
+<div class="wc-tpp-package-row">
+    <p class="form-field">
+        <label>{{ 'Quantity'|__('wc-tier-package-prices') }}</label>
+        <input type="number"
+               name="_wc_tpp_packages[{{ index|esc_attr }}][qty]"
+               value="{{ package.qty|default('')|esc_attr }}"
+               placeholder="{{ 'e.g., 10'|__('wc-tier-package-prices') }}"
+               min="1"
+               step="1"
+               class="short">
+    </p>
+    <p class="form-field">
+        <label>{{ 'Fixed Price'|__('wc-tier-package-prices') }}</label>
+        <input type="text"
+               name="_wc_tpp_packages[{{ index|esc_attr }}][price]"
+               value="{{ package.price|default('')|esc_attr }}"
+               placeholder="{{ 'e.g., 99.99'|__('wc-tier-package-prices') }}"
+               class="short wc_input_price">
+    </p>
+    <p class="form-field">
+        <label>{{ 'Label (Optional)'|__('wc-tier-package-prices') }}</label>
+        <input type="text"
+               name="_wc_tpp_packages[{{ index|esc_attr }}][label]"
+               value="{{ package.label|default('')|esc_attr }}"
+               placeholder="{{ 'e.g., Starter Pack'|__('wc-tier-package-prices') }}"
+               class="short">
+    </p>
+    <button type="button" class="button wc-tpp-remove-package">{{ 'Remove'|__('wc-tier-package-prices') }}</button>
+</div>