Initial commit: Homelab Infrastructure Dashboard

Features:
- Real-time Proxmox cluster monitoring (nodes, LXC containers)
- Camera integration with go2rtc streams
- Arr stack download progress monitoring
- PBS backup status
- Docker container status
- Uptime Kuma service health
- FastAPI backend with HTMX frontend

app/templates/partials/cameras.html

@@ -0,0 +1,22 @@
+<div class="grid grid-cols-2 gap-2">
+    {% for camera in cameras[:4] %}
+    <div class="camera-thumb relative group">
+        <img src="/api/camera-snapshot/{{ camera }}"
+             alt="{{ camera }}"
+             class="w-full h-full"
+             loading="lazy"
+             onerror="this.src='data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 56%22><rect fill=%22%231f2937%22 width=%22100%22 height=%2256%22/><text x=%2250%22 y=%2228%22 text-anchor=%22middle%22 fill=%22%236b7280%22 font-size=%228%22>No Signal</text></svg>'">
+        <div class="absolute inset-0 bg-black/60 opacity-0 group-hover:opacity-100 transition-opacity flex items-center justify-center">
+            <a href="{{ go2rtc_url }}/stream.html?src={{ camera }}" target="_blank" class="text-white text-xs hover:text-cyan-400">
+                {{ camera }}
+            </a>
+        </div>
+        <div class="absolute bottom-1 left-1 text-[10px] text-white bg-black/50 px-1 rounded">{{ camera }}</div>
+    </div>
+    {% endfor %}
+</div>
+{% if cameras | length > 4 %}
+<a href="{{ go2rtc_url }}" target="_blank" class="block text-center text-xs text-gray-500 hover:text-cyan-400 mt-2">
+    View all {{ cameras | length }} cameras
+</a>
+{% endif %}