Real icon, and open straight into the game instead of the splash

icon.png replaces the scaffold placeholder — resized to 512x512 and
palette-quantized (1.9MB source -> 52.9KB) to stay close to the packaging
guide's 40 KiB guidance with no visible quality loss at icon size. Verified
station-master_x86_64.s9pk builds clean with a single icon.* file (the
packer errors on more than one) and `s9pk inspect` confirms icon.png is
packed correctly.

The `ui` interface now opens at `/play.html` instead of `/`. Root serves
index.html, the game's marketing splash — identical to the public static
solitaire site, and with no lobby or Multiplayer button on it; both live on
play.html (src/web/main.ts's `start()`, reached from index.html's door
link). That page is right for a stranger landing on the public site, wrong
for someone who just installed a dedicated multiplayer server and found
what looked like the same solitaire page with no way to host or join a
game. Verified: fetching /play.html from inside the container and over the
service's public address both return the page with the Multiplayer button
present.

Reinstalled on phoenix.local after each change.

README.md

@@ -1,5 +1,5 @@
 <p align="center">
-  <img src="icon.svg" alt="Station Master Logo" width="21%">
+  <img src="icon.png" alt="Station Master Logo" width="21%">
 </p>
 
 # Station Master on StartOS

icon.svg

@@ -1,11 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
-  <defs>
-    <linearGradient id="bg" x1="0" y1="0" x2="1" y2="1">
-      <stop offset="0%" stop-color="#4F46E5"/>
-      <stop offset="100%" stop-color="#7C3AED"/>
-    </linearGradient>
-  </defs>
-  <rect width="512" height="512" rx="96" fill="url(#bg)"/>
-  <path d="M256 120c-88.4 0-160 58.1-160 129.8 0 41.4 23.6 78.4 60.5 103.2l-12.9 51.5a8 8 0 0 0 11.6 8.8l62.6-36.1c12.3 2.5 25.2 3.8 38.2 3.8 88.4 0 160-58.1 160-129.8S344.4 120 256 120z" fill="white" opacity="0.95"/>
-  <text x="256" y="270" text-anchor="middle" font-family="Arial, Helvetica, sans-serif" font-weight="bold" font-size="64" fill="#4F46E5">Hello!</text>
-</svg>

startos/interfaces.ts

@@ -18,7 +18,12 @@ export const setInterfaces = sdk.setupInterfaces(async ({ effects }) => {
     masked: false,
     schemeOverride: null,
     username: null,
-    path: '',
+    // `/` serves index.html — the game's marketing splash, identical to the public static
+    // solitaire site and with no lobby or Multiplayer button on it (both live on play.html; see
+    // src/web/main.ts's `start()` and the door link in index.html). That page makes sense for a
+    // stranger landing on the public site, not for someone who just installed a dedicated
+    // multiplayer server — so this interface opens straight at the game screen instead.
+    path: '/play.html',
     query: {},
   })