Add a general SPA fallback instead of an explicit per-route list

Direct hits on client-side routes not in the hardcoded list (e.g. a
browser refresh on /faktiska or /udens-temperatura) 404ed instead of
loading the app — a known limitation that was actually hit in
production. Real files now serve as-is; anything else falls back to
index.html so the SolidJS router handles it, matching the existing
"TODO rewrite in more generic way" comment. Future routes need no
backend changes.

src/main/scala/server/Server.scala

@@ -2,6 +2,7 @@ package server
 
 import cats.effect._
 import cats.implicits.toTraverseOps
+import cats.syntax.semigroupk._
 import com.comcast.ip4s.IpLiteralSyntax
 import data.DataService
 import db.PostgresService
@@ -203,18 +204,20 @@ class Server(postgresService: PostgresService, dataService: DataService, fetch:
 
   private val apiRoutesCors = CORS(apiRoutes, corsConfig)
 
-  private val httpApp = Router(
+  // Real files (JS/CSS/images/favicon) are served as-is; anything else falls
-    "/" -> staticcontent.fileService[IO](FileService.Config("./web/dist")),
+  // back to index.html so the SolidJS router can handle it client-side. This
-    "/api" -> apiRoutesCors,
+  // replaces an explicit per-route list that silently 404ed on a direct hit
+  // (e.g. a browser refresh) for any client-side route not on the list —
+  // real, observed on /faktiska and /udens-temperatura in production.
+  private val assets = staticcontent.fileService[IO](FileService.Config("./web/dist"))
+  private val spaFallback = HttpRoutes.of[IO] {
+    case req @ GET -> _ =>
+      StaticFile.fromPath(Path("./web/dist/index.html"), Some(req)).getOrElseF(NotFound())
+  }
 
-    // TODO rewrite in more generic way
+  private val httpApp = Router(
-    "/station" -> staticcontent.fileService[IO](FileService.Config("./web/dist")),
+    "/api" -> apiRoutesCors,
-    "/cities" -> staticcontent.fileService[IO](FileService.Config("./web/dist")),
+    "/" -> (assets <+> spaFallback),
-    "/latvia" -> staticcontent.fileService[IO](FileService.Config("./web/dist")),
-    "/database" -> staticcontent.fileService[IO](FileService.Config("./web/dist")),
-    "/harmonie" -> staticcontent.fileService[IO](FileService.Config("./web/dist")),
-    "/lvgmc-forecast" -> staticcontent.fileService[IO](FileService.Config("./web/dist")),
-    "/bridinajumi" -> staticcontent.fileService[IO](FileService.Config("./web/dist")),
   ).orNotFound
 
   def run: IO[ExitCode] =