Rewrite: Next.js → ASP.NET Core 10 Razor Pages

Full rewrite of the portfolio site from Next.js 14 to .NET 10:

- ASP.NET Core 10 Razor Pages, no Node.js dependency
- EF Core 10 + SQLite (same schema as before — data survives upgrade)
- Cookie authentication (same single-password model)
- Resend contact form via HttpClient
- Bilingual FA/EN via locale cookie + BasePageModel
- All UI ported to Razor Pages with Tailwind CDN + custom CSS
- Vanilla JS: particles, typewriter, cursor, animations, portfolio modal
- Dockerfile: SDK 10.0-alpine → aspnet 10.0-alpine (no npm/Node needed)
- CI/CD: dropped NPM_TOKEN, ADMIN_SESSION_SECRET — pure dotnet publish

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

Pages/LocalePage.cshtml.cs

@@ -0,0 +1,25 @@
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+
+namespace SoroushAsadi.Pages;
+
+/// <summary>POST /locale — sets the locale cookie and redirects back.</summary>
+[IgnoreAntiforgeryToken]
+public class LocalePageModel : PageModel
+{
+    public IActionResult OnPost(string locale, string returnUrl = "/")
+    {
+        if (locale is not "fa" and not "en") locale = "fa";
+
+        Response.Cookies.Append("locale", locale, new CookieOptions
+        {
+            Expires  = DateTimeOffset.UtcNow.AddYears(1),
+            HttpOnly = false,
+            SameSite = SameSiteMode.Lax,
+            Path     = "/"
+        });
+
+        if (!Url.IsLocalUrl(returnUrl)) returnUrl = "/";
+        return LocalRedirect(returnUrl);
+    }
+}