fix(ssr): remove spider-only gate — serve full SSR to all users

The CSR shell served to regular browsers caused a visible blank-to-content
flash: the browser painted an empty <app-root>, then waited for Angular
to bootstrap and lazy-load the route before any content appeared.

All requests now route through the Angular SSR engine (appEngine.handle()),
which fetches fresh station config from the API via APP_INITIALIZER before
rendering. The first paint carries real content, colors, and assets.

server.ts

@@ -8,7 +8,6 @@ import * as fs from 'node:fs';
 import * as http from 'node:http';
 import * as https from 'node:https';
 import * as path from 'node:path';
-import { isSpider, getUserAgent } from './spider_detection';
 
 /**
  * Manually import and register the Angular app engine manifest.
@@ -263,17 +262,17 @@ if (isMainModule(import.meta.url)) {
   const server = http.createServer();
   server.on('request', async (req, res) => {
     try {
-      // ── Spider detection gate ──────────────────────────
-      // Only search engine spiders get full SSR rendering.
-      // Regular users receive the CSR app shell from disk,
-      // enhanced with fresh station config injected at runtime.
-      const userAgent = getUserAgent(req.headers);
-      if (!isSpider(userAgent)) {
-        await serveCsrShell(res);
-        return;
-      }
-
-      // Spider — render full HTML via Angular SSR with live API data
+      // ── SSR rendering for all users ────────────────────
+      // Every user — spiders and regular browsers — gets full
+      // Angular SSR rendering. The SSR engine (main.server.ts)
+      // fetches fresh station config from the API via APP_INITIALIZER
+      // before rendering, so the first paint carries real content,
+      // colors, and assets. No CSR shell flash, no blank gap.
+      //
+      // NOTE: The spider-only SSR gate was removed because serving
+      // a CSR shell (empty <app-root>) to regular browsers caused
+      // a visible blank-to-content transition. The SSR engine is
+      // fast enough to handle regular traffic.
       await requestHandler(req, res, () => {
         res.statusCode = 404;
         res.end('Not Found');