Complete L1 router and template migration

- Full implementation of runs, recipes, cache routers with templates
- Auth and storage routers fully migrated
- Jinja2 templates for all L1 pages
- Service layer for auth and storage

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/templates/runs/list.html

@@ -0,0 +1,45 @@
+{% extends "base.html" %}
+
+{% block title %}Runs - Art-DAG L1{% endblock %}
+
+{% block content %}
+<div class="max-w-6xl mx-auto">
+    <div class="flex items-center justify-between mb-6">
+        <h1 class="text-3xl font-bold">Execution Runs</h1>
+        <a href="/recipes" class="text-gray-400 hover:text-white">Browse Recipes &rarr;</a>
+    </div>
+
+    {% if runs %}
+    <div class="space-y-4" id="runs-list">
+        {% for run in runs %}
+        {% include "runs/_run_card.html" %}
+        {% endfor %}
+    </div>
+
+    {% if has_more %}
+    <div hx-get="/runs?offset={{ offset + limit }}"
+         hx-trigger="revealed"
+         hx-swap="afterend"
+         hx-select="#runs-list > *"
+         class="h-20 flex items-center justify-center text-gray-500">
+        Loading more...
+    </div>
+    {% endif %}
+
+    {% else %}
+    <div class="bg-gray-800 border border-gray-700 rounded-lg p-12 text-center">
+        <div class="text-gray-500 mb-4">
+            <svg class="w-16 h-16 mx-auto mb-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5"
+                      d="M13 10V3L4 14h7v7l9-11h-7z"/>
+            </svg>
+            <p class="text-xl">No runs yet</p>
+        </div>
+        <p class="text-gray-600 mb-6">Execute a recipe to see your runs here.</p>
+        <a href="/recipes" class="bg-blue-600 hover:bg-blue-700 px-6 py-2 rounded font-medium">
+            Browse Recipes
+        </a>
+    </div>
+    {% endif %}
+</div>
+{% endblock %}