added alembic database migrations, json import/export

templates/admin/backups.html

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+{% extends "admin/index.html" %}
+
+{% block admin_content %}
+<div class="card">
+    <div class="card-header">
+        <h5 class="mb-0">Database Backups</h5>
+    </div>
+    <div class="card-body">
+        <p>
+            Create a snapshot of the database or restore from a previous backup. Backups are stored in the <code>/backups</code> directory.
+        </p>
+
+        <div class="mb-3">
+            <form action="/admin/backups/create" method="post" class="d-inline">
+                <button type="submit" class="btn btn-primary">
+                    <i class="bi bi-cloud-download"></i> Backup Now
+                </button>
+            </form>
+        </div>
+
+        <hr>
+
+        <h5>Restore from Backup</h5>
+        <form action="/admin/backups/restore" method="post" enctype="multipart/form-data">
+            <div class="mb-3">
+                <label for="backup-file" class="form-label">Select backup file to restore</label>
+                <select class="form-select" id="backup-file" name="backup_file">
+                    {% for backup in backups %}
+                        <option value="{{ backup }}">{{ backup }}</option>
+                    {% endfor %}
+                </select>
+            </div>
+            <button type="submit" class="btn btn-success">
+                <i class="bi bi-cloud-upload"></i> Restore
+            </button>
+        </form>
+    </div>
+</div>
+{% endblock %}

templates/admin/imports.html

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+{% extends "admin/index.html" %}
+
+{% block admin_content %}
+<div class="card">
+    <div class="card-header">
+        <h5 class="mb-0">Import/Export All Data</h5>
+    </div>
+    <div class="card-body">
+        <p>
+            This section allows you to export all your data (foods, meals, plans, etc.) into a single JSON file. 
+            You can also import this data back, which will overwrite any existing data. 
+            This is useful for backups or migrating to a new instance.
+        </p>
+        
+        <div class="mb-3">
+            <a href="/export/all" class="btn btn-primary" download="meal_planner_backup.json">
+                <i class="bi bi-download"></i> Export All Data
+            </a>
+        </div>
+
+        <hr>
+
+        <h5>Import Data</h5>
+        <form id="import-form" action="/import/all" method="post" enctype="multipart/form-data">
+            <div class="mb-3">
+                <label for="import-file" class="form-label">Select JSON file to import</label>
+                <input class="form-control" type="file" id="import-file" name="file" accept=".json">
+            </div>
+            <button type="submit" class="btn btn-success">
+                <i class="bi bi-upload"></i> Import and Overwrite
+            </button>
+        </form>
+    </div>
+</div>
+{% endblock %}

templates/admin/index.html

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+{% extends "base.html" %}
+
+{% block content %}
+<h2 class="mb-4">Admin</h2>
+
+<ul class="nav nav-tabs" id="adminTab" role="tablist">
+    <li class="nav-item" role="presentation">
+        <a class="nav-link" id="imports-tab" href="/admin/imports">Imports</a>
+    </li>
+    <li class="nav-item" role="presentation">
+        <a class="nav-link" id="backups-tab" href="/admin/backups">Backups</a>
+    </li>
+</ul>
+
+<div class="tab-content mt-3">
+    {% block admin_content %}{% endblock %}
+</div>
+{% endblock %}