This commit integrates ASP.NET Core Identity into the application to enable user registration, login, and management. This lays the groundwork for securing data per user.
**Key Changes:**
* **DbContext Configuration:**
* Modified `ApplicationDbContext.cs` to inherit from `IdentityDbContext<IdentityUser>`.
* Removed an unnecessary `using` statement from `ApplicationDbContext.cs`.
* **Program.cs Setup:**
* Configured `AddDefaultIdentity<IdentityUser>` with `AddEntityFrameworkStores<ApplicationDbContext>()` to register Identity services.
* Ensured correct ordering of `UseAuthentication()` and `UseAuthorization()` middleware.
* Added `app.MapRazorPages()` to enable the Identity UI pages.
* Verified core package versions in `turf_tasker.csproj` for consistency across EF Core and Identity components (`8.0.6`).
* **Identity UI:**
* Scaffolded ASP.NET Core Identity pages (Login, Register, Manage, etc.) to provide the user interface for authentication.
* Added a `_LoginPartial.cshtml` partial view to the `Views/Shared` folder.
* Rendered `_LoginPartial` in `Views/Shared/_Layout.cshtml` to display login/register/logout links in the navigation bar.
* **Migrations:**
* Created and applied a new migration (`AddIdentitySchema`) to create the necessary ASP.NET Core Identity database tables (e.g., `AspNetUsers`, `AspNetRoles`).
