feat: add GreenHome web frontend and weather dashboard

src/GreenHome.Api/Program.cs

@@ -31,6 +31,9 @@ ConfigureMiddleware(app);
 ConfigureStaticFiles(app);
 app.MapControllers();
 
+// SPA fallback: serve index.html for non-API routes (client-side routing)
+app.MapFallbackToFile("index.html");
+
 app.Run();
 
 // ============================================================
@@ -43,6 +46,10 @@ void ConfigureCoreServices(WebApplicationBuilder builder)
     builder.Services.AddEndpointsApiExplorer();
     builder.Services.AddOpenApi();
 
+    // Caching & HTTP client factory (used by WeatherController proxy with tiered caching)
+    builder.Services.AddMemoryCache();
+    builder.Services.AddHttpClient();
+
     builder.Services.AddAutoMapper(typeof(GreenHome.Application.MappingProfile));
     builder.Services.AddValidatorsFromAssemblyContaining<GreenHome.Application.DeviceDtoValidator>();
 
@@ -146,4 +153,8 @@ void ConfigureStaticFiles(WebApplication app)
         RequestPath = "/files",
         ContentTypeProvider = provider
     });
+
+    // Serve the SPA from wwwroot (Vite build output)
+    app.UseDefaultFiles();
+    app.UseStaticFiles();
 }