docs: add reference Python/Flask implementation

Previous version of Tanabata used as visual and functional reference
for the new Go + SvelteKit rewrite.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/reference/web/static/service/browserconfig.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<browserconfig>
+    <msapplication>
+        <tile>
+            <square70x70logo src="/images/ms-icon-70x70.png" />
+            <square150x150logo src="/images/ms-icon-150x150.png" />
+            <square310x310logo src="/images/ms-icon-310x310.png" />
+            <TileColor>#615880</TileColor>
+        </tile>
+    </msapplication>
+</browserconfig>

docs/reference/web/static/service/robots.txt

@@ -0,0 +1,2 @@
+User-agent: *
+Disallow: /

docs/reference/web/static/service/tanabata.webmanifest

@@ -0,0 +1,49 @@
+{
+	"name": "Tanabata File Manager",
+	"short_name": "Tanabata",
+	"lang": "en-US",
+	"description": "Tanabata File Manager PWA",
+	"start_url": "/",
+	"scope": "/",
+	"display": "standalone",
+	"theme_color": "#615880",
+	"background_color": "#312F45",
+	"icons": [
+		{
+			"src": "\/images\/android-icon-36x36.png",
+			"sizes": "36x36",
+			"type": "image\/png",
+			"density": "0.75"
+		},
+		{
+			"src": "\/images\/android-icon-48x48.png",
+			"sizes": "48x48",
+			"type": "image\/png",
+			"density": "1.0"
+		},
+		{
+			"src": "\/images\/android-icon-72x72.png",
+			"sizes": "72x72",
+			"type": "image\/png",
+			"density": "1.5"
+		},
+		{
+			"src": "\/images\/android-icon-96x96.png",
+			"sizes": "96x96",
+			"type": "image\/png",
+			"density": "2.0"
+		},
+		{
+			"src": "\/images\/android-icon-144x144.png",
+			"sizes": "144x144",
+			"type": "image\/png",
+			"density": "3.0"
+		},
+		{
+			"src": "\/images\/android-icon-192x192.png",
+			"sizes": "192x192",
+			"type": "image\/png",
+			"density": "4.0"
+		}
+	]
+}