Initial implementation of TuneRipper API backend

- Add Health, Video, and Download controllers with endpoints for health checks, video details, processing, status, results, and simulated downloads
- Implement IVideoService for YouTube URL validation and mock video info
- Add API models for responses and job status tracking
- Configure DI, CORS (BlazorPolicy), OpenAPI, and root metadata endpoint in Program.cs
- Add README with usage, troubleshooting, and development notes
- Minor project file cleanup and encoding fix

TuneRipper.Api/Program.cs

@@ -1,8 +1,24 @@
+using TuneRipper.Api.Services;
+
 var builder = WebApplication.CreateBuilder(args);
 
 // Add services to the container.
-
 builder.Services.AddControllers();
+
+// Register services
+builder.Services.AddScoped<IVideoService, VideoService>();
+
+// Add CORS for Blazor WebAssembly client
+builder.Services.AddCors(options =>
+{
+    options.AddPolicy("BlazorPolicy", policy =>
+    {
+        policy.AllowAnyOrigin()
+              .AllowAnyMethod()
+              .AllowAnyHeader();
+    });
+});
+
 // Learn more about configuring OpenAPI at https://aka.ms/aspnet/openapi
 builder.Services.AddOpenApi();
 
@@ -16,8 +32,50 @@ if (app.Environment.IsDevelopment())
 
 app.UseHttpsRedirection();
 
+// Enable CORS
+app.UseCors("BlazorPolicy");
+
 app.UseAuthorization();
 
+// Add root endpoint with startup info
+app.MapGet("/", (IWebHostEnvironment env) => new
+{
+    service = "TuneRipper API",
+    version = "1.0.0",
+    status = "running",
+    timestamp = DateTime.UtcNow,
+    environment = env.EnvironmentName,
+    urls = new
+    {
+        https = "https://localhost:7160",
+        http = "http://localhost:5112"
+    },
+    endpoints = new
+    {
+        health = "/api/health",
+        video_details = "/api/video/details?url={youtubeUrl}",
+        process_video = "/api/video/process",
+        check_status = "/api/video/status/{jobId}",
+        get_result = "/api/video/result/{jobId}",
+        download = "/api/download/{jobId}",
+        openapi = "/openapi/v1.json"
+    },
+    testing = new
+    {
+        httpFile = "Use api-tests.http to test endpoints",
+        startWith = "GET /api/health to verify API is running"
+    }
+});
+
 app.MapControllers();
 
+// Log startup information
+app.Logger.LogInformation("?? TuneRipper API is starting...");
+app.Logger.LogInformation("?? Environment: {Environment}", app.Environment.EnvironmentName);
+app.Logger.LogInformation("?? API will be available at:");
+app.Logger.LogInformation("   • HTTPS: https://localhost:7160");
+app.Logger.LogInformation("   • HTTP: http://localhost:5112");
+app.Logger.LogInformation("?? Health check: /api/health");
+app.Logger.LogInformation("?? API info: /");
+
 app.Run();