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/Admin/Login.cshtml.cs

@@ -0,0 +1,33 @@
+using System.Security.Claims;
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.AspNetCore.Authentication.Cookies;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using SoroushAsadi.Services;
+
+namespace SoroushAsadi.Pages.Admin;
+
+public class LoginModel(AuthService auth) : PageModel
+{
+    public string Error { get; private set; } = "";
+
+    public void OnGet() { }
+
+    public async Task<IActionResult> OnPostAsync(string password, string returnUrl = "/Admin")
+    {
+        if (!auth.VerifyPassword(password))
+        {
+            Error = "Incorrect password.";
+            return Page();
+        }
+
+        var claims = new[] { new Claim(ClaimTypes.Name, "admin") };
+        var identity = new ClaimsIdentity(claims, CookieAuthenticationDefaults.AuthenticationScheme);
+        await HttpContext.SignInAsync(
+            CookieAuthenticationDefaults.AuthenticationScheme,
+            new ClaimsPrincipal(identity));
+
+        if (!Url.IsLocalUrl(returnUrl)) returnUrl = "/Admin";
+        return LocalRedirect(returnUrl);
+    }
+}