perf: add defer to scripts and lazy loading to images

Add defer attribute to 145 <script> tags across 103 template files
(PERF-067) and loading="lazy" to 22 <img> tags across 13 template
files (PERF-058). Both improve page load performance.

Validator totals: 0 errors, 2 warnings, 1360 info (down from 1527).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/loyalty/templates/loyalty/admin/analytics.html

@@ -158,5 +158,5 @@
 {% endblock %}
 
 {% block extra_scripts %}
-<script src="{{ url_for('loyalty_static', path='admin/js/loyalty-analytics.js') }}"></script>
+<script defer src="{{ url_for('loyalty_static', path='admin/js/loyalty-analytics.js') }}"></script>
 {% endblock %}

app/modules/loyalty/templates/loyalty/admin/merchant-detail.html

@@ -234,5 +234,5 @@
 {% endblock %}
 
 {% block extra_scripts %}
-<script src="{{ url_for('loyalty_static', path='admin/js/loyalty-merchant-detail.js') }}"></script>
+<script defer src="{{ url_for('loyalty_static', path='admin/js/loyalty-merchant-detail.js') }}"></script>
 {% endblock %}

app/modules/loyalty/templates/loyalty/admin/merchant-settings.html

@@ -176,5 +176,5 @@
 {% endblock %}
 
 {% block extra_scripts %}
-<script src="{{ url_for('loyalty_static', path='admin/js/loyalty-merchant-settings.js') }}"></script>
+<script defer src="{{ url_for('loyalty_static', path='admin/js/loyalty-merchant-settings.js') }}"></script>
 {% endblock %}

app/modules/loyalty/templates/loyalty/admin/programs.html

@@ -237,5 +237,5 @@
 {% endblock %}
 
 {% block extra_scripts %}
-<script src="{{ url_for('loyalty_static', path='admin/js/loyalty-programs.js') }}"></script>
+<script defer src="{{ url_for('loyalty_static', path='admin/js/loyalty-programs.js') }}"></script>
 {% endblock %}

app/modules/loyalty/templates/loyalty/store/card-detail.html

@@ -154,5 +154,5 @@
 {% endblock %}
 
 {% block extra_scripts %}
-<script src="{{ url_for('loyalty_static', path='store/js/loyalty-card-detail.js') }}"></script>
+<script defer src="{{ url_for('loyalty_static', path='store/js/loyalty-card-detail.js') }}"></script>
 {% endblock %}

app/modules/loyalty/templates/loyalty/store/cards.html

@@ -146,5 +146,5 @@
 {% endblock %}
 
 {% block extra_scripts %}
-<script src="{{ url_for('loyalty_static', path='store/js/loyalty-cards.js') }}"></script>
+<script defer src="{{ url_for('loyalty_static', path='store/js/loyalty-cards.js') }}"></script>
 {% endblock %}

app/modules/loyalty/templates/loyalty/store/enroll.html

@@ -142,5 +142,5 @@
 {% endblock %}
 
 {% block extra_scripts %}
-<script src="{{ url_for('loyalty_static', path='store/js/loyalty-enroll.js') }}"></script>
+<script defer src="{{ url_for('loyalty_static', path='store/js/loyalty-enroll.js') }}"></script>
 {% endblock %}

app/modules/loyalty/templates/loyalty/store/settings.html

@@ -154,5 +154,5 @@
 {% endblock %}
 
 {% block extra_scripts %}
-<script src="{{ url_for('loyalty_static', path='store/js/loyalty-settings.js') }}"></script>
+<script defer src="{{ url_for('loyalty_static', path='store/js/loyalty-settings.js') }}"></script>
 {% endblock %}

app/modules/loyalty/templates/loyalty/store/stats.html

@@ -130,5 +130,5 @@
 {% endblock %}
 
 {% block extra_scripts %}
-<script src="{{ url_for('loyalty_static', path='store/js/loyalty-stats.js') }}"></script>
+<script defer src="{{ url_for('loyalty_static', path='store/js/loyalty-stats.js') }}"></script>
 {% endblock %}

app/modules/loyalty/templates/loyalty/store/terminal.html

@@ -305,5 +305,5 @@
 {% endblock %}
 
 {% block extra_scripts %}
-<script src="{{ url_for('loyalty_static', path='store/js/loyalty-terminal.js') }}"></script>
+<script defer src="{{ url_for('loyalty_static', path='store/js/loyalty-terminal.js') }}"></script>
 {% endblock %}

app/modules/loyalty/templates/loyalty/storefront/dashboard.html

@@ -222,5 +222,5 @@
 {% endblock %}
 
 {% block extra_scripts %}
-<script src="{{ url_for('loyalty_static', path='storefront/js/loyalty-dashboard.js') }}"></script>
+<script defer src="{{ url_for('loyalty_static', path='storefront/js/loyalty-dashboard.js') }}"></script>
 {% endblock %}

app/modules/loyalty/templates/loyalty/storefront/enroll.html

@@ -131,5 +131,5 @@
 {% endblock %}
 
 {% block extra_scripts %}
-<script src="{{ url_for('loyalty_static', path='storefront/js/loyalty-enroll.js') }}"></script>
+<script defer src="{{ url_for('loyalty_static', path='storefront/js/loyalty-enroll.js') }}"></script>
 {% endblock %}

app/modules/loyalty/templates/loyalty/storefront/history.html

@@ -103,5 +103,5 @@
 {% endblock %}
 
 {% block extra_scripts %}
-<script src="{{ url_for('loyalty_static', path='storefront/js/loyalty-history.js') }}"></script>
+<script defer src="{{ url_for('loyalty_static', path='storefront/js/loyalty-history.js') }}"></script>
 {% endblock %}