feat: Phase 1+2 - JWT auth, dashboard metrics API, DB indexes

Phase 1 - JWT Auth Foundation:
- Replace token auth with djangorestframework-simplejwt
- POST /api/v1/admin/auth/login/ - returns access + refresh JWT
- POST /api/v1/auth/refresh/ - JWT refresh
- GET /api/v1/auth/me/ - current admin profile
- GET /api/v1/health/ - DB health check
- Add ledger app to INSTALLED_APPS

Phase 2 - Dashboard Metrics API:
- GET /api/v1/dashboard/metrics/ - revenue, partners, events, tickets
- GET /api/v1/dashboard/revenue/ - 7-day revenue vs payouts chart data
- GET /api/v1/dashboard/activity/ - last 10 platform events feed
- GET /api/v1/dashboard/actions/ - KYC queue, flagged events, pending payouts

DB Indexes (dashboard query optimisation):
- RazorpayTransaction: status, captured_at
- Partner: status, kyc_compliance_status
- Event: event_status, start_date, created_date
- Booking: created_date
- PaymentTransaction: payment_type, payment_transaction_status, payment_transaction_date

Infra:
- Add Dockerfile for eventify-backend container
- Add simplejwt to requirements.txt
- All 4 dashboard views use IsAuthenticated permission class

templates/events/event_form.html

@@ -1,49 +1,50 @@
 {% extends 'base.html' %}
 {% block content %}
-    <div class="container mt-4">
-        <h3>{% if object %}Edit{% else %}Add{% endif %} Event</h3>
+<div class="container mt-4">
+    <h3>{% if object %}Edit{% else %}Add{% endif %} Event</h3>
 
-        <form method="post" novalidate>
-            {% csrf_token %}
+    <form method="post" novalidate>
+        {% csrf_token %}
+        {{ form.media }}
 
-            {% for field in form %}
-                <div class="mb-3">
-                    {{ field.label_tag }}
-                    {{ field }}
-                    {% for error in field.errors %}
-                        <div class="text-danger">{{ error }}</div>
-                    {% endfor %}
-                </div>
+        {% for field in form %}
+        <div class="mb-3">
+            {{ field.label_tag }}
+            {{ field }}
+            {% for error in field.errors %}
+            <div class="text-danger">{{ error }}</div>
             {% endfor %}
+        </div>
+        {% endfor %}
 
-            <button class="btn btn-primary">Save</button>
-            <a class="btn btn-secondary" href="{% url 'events:event_list' %}">Cancel</a>
-        </form>
-    </div>
+        <button class="btn btn-primary">Save</button>
+        <a class="btn btn-secondary" href="{% url 'events:event_list' %}">Cancel</a>
+    </form>
+</div>
 
-    <script>
-        document.addEventListener('DOMContentLoaded', function() {
-            const allYearEventCheckbox = document.getElementById('id_all_year_event');
-            const startDateField = document.getElementById('id_start_date');
-            const endDateField = document.getElementById('id_end_date');
-            const startTimeField = document.getElementById('id_start_time');
-            const endTimeField = document.getElementById('id_end_time');
+<script>
+    document.addEventListener('DOMContentLoaded', function () {
+        const allYearEventCheckbox = document.getElementById('id_all_year_event');
+        const startDateField = document.getElementById('id_start_date');
+        const endDateField = document.getElementById('id_end_date');
+        const startTimeField = document.getElementById('id_start_time');
+        const endTimeField = document.getElementById('id_end_time');
 
-            function toggleDateTimeFields() {
-                const isDisabled = allYearEventCheckbox.checked;
-                startDateField.disabled = isDisabled;
-                endDateField.disabled = isDisabled;
-                startTimeField.disabled = isDisabled;
-                endTimeField.disabled = isDisabled;
-            }
+        function toggleDateTimeFields() {
+            const isDisabled = allYearEventCheckbox.checked;
+            startDateField.disabled = isDisabled;
+            endDateField.disabled = isDisabled;
+            startTimeField.disabled = isDisabled;
+            endTimeField.disabled = isDisabled;
+        }
 
-            // Set initial state
-            toggleDateTimeFields();
+        // Set initial state
+        toggleDateTimeFields();
 
-            // Listen for checkbox changes
-            if (allYearEventCheckbox) {
-                allYearEventCheckbox.addEventListener('change', toggleDateTimeFields);
-            }
-        });
-    </script>
-{% endblock %}
+        // Listen for checkbox changes
+        if (allYearEventCheckbox) {
+            allYearEventCheckbox.addEventListener('change', toggleDateTimeFields);
+        }
+    });
+</script>
+{% endblock %}