fix(webapp): serve manifest in development

WebApp/static/manifest.webmanifest

@@ -0,0 +1,31 @@
+{
+	"name": "PhoneCam Web Dashboard",
+	"short_name": "PhoneCam",
+	"description": "Monitor camera devices, motion events, and recordings from an installable web dashboard.",
+	"start_url": "/",
+	"scope": "/",
+	"display": "standalone",
+	"background_color": "#0a0a0c",
+	"theme_color": "#0a0a0c",
+	"orientation": "portrait-primary",
+	"icons": [
+		{
+			"src": "/icons/pwa-192x192.png",
+			"sizes": "192x192",
+			"type": "image/png",
+			"purpose": "any"
+		},
+		{
+			"src": "/icons/pwa-512x512.png",
+			"sizes": "512x512",
+			"type": "image/png",
+			"purpose": "any"
+		},
+		{
+			"src": "/icons/maskable-512x512.png",
+			"sizes": "512x512",
+			"type": "image/png",
+			"purpose": "maskable"
+		}
+	]
+}