chore(codebase): full cleanup pass

backend/Infrastructure/Security/GenerateJwtToken.cs

@@ -19,10 +19,10 @@ public static class JwtTokenHelper
         string lastname,
         string? portraitUrl)
     {
-        var securityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(key));
-        var credentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256);
+        SymmetricSecurityKey securityKey = new(Encoding.UTF8.GetBytes(key));
+        SigningCredentials credentials = new(securityKey, SecurityAlgorithms.HmacSha256);
 
-        var claims = new List<Claim>([
+        List<Claim> claims = new([
             new Claim(JwtRegisteredClaimNames.Sub, userId),
             new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString()),
             new Claim(ClaimTypes.NameIdentifier, userId), new Claim(ClaimTypes.Email, email),
@@ -40,10 +40,10 @@ public static class JwtTokenHelper
             claims.Add(new Claim(KnownClaims.PortraitUrl, portraitUrl));
         }
 
-        var token = new JwtSecurityToken(
-            issuer: issuer,
-            audience: audience,
-            claims: claims,
+        JwtSecurityToken token = new(
+            issuer,
+            audience,
+            claims,
             expires: DateTime.Now.Add(expiresIn),
             signingCredentials: credentials);