Remove assets/ prefix from installer paths

The old server had an assets/ prefix in its routing, but DO Spaces
CDN serves files directly from the bucket root.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/main/csharp/net/eagle0/clients/win/installer/EagleInstaller/CredentialManager.cs

@@ -1,53 +1,5 @@
-using System;
-using Microsoft.Win32;
-
 namespace EagleInstaller {
     public class CredentialManager {
-        private const string RegistryKeyPath = @"SOFTWARE\Eagle0\Launcher";
-        private const string ServerUrlValueName = "ServerUrl";
-        private const string DefaultServerUrl = "https://assets.eagle0.net";
-
-        /// <summary>
-        /// Loads saved server URL. Returns default if none found.
-        /// </summary>
-        public static string LoadServerUrl() {
-            try {
-                using (var key = Registry.CurrentUser.OpenSubKey(RegistryKeyPath, false)) {
-                    if (key != null) {
-                        var url = key.GetValue(ServerUrlValueName) as string;
-                        if (!string.IsNullOrEmpty(url)) { return url; }
-                    }
-                }
-            } catch (Exception) {
-                // If anything fails, return default
-            }
-            return DefaultServerUrl;
-        }
-
-        /// <summary>
-        /// Saves server URL to registry.
-        /// </summary>
-        public static void SaveServerUrl(string serverUrl) {
-            try {
-                using (var key = Registry.CurrentUser.CreateSubKey(RegistryKeyPath)) {
-                    key.SetValue(ServerUrlValueName, serverUrl ?? DefaultServerUrl);
-                }
-            } catch (Exception) {
-                // Ignore errors when saving
-            }
-        }
-
-        /// <summary>
-        /// Clears saved settings.
-        /// </summary>
-        public static void ClearSettings() {
-            try {
-                using (var key = Registry.CurrentUser.OpenSubKey(RegistryKeyPath, true)) {
-                    if (key != null) { key.DeleteValue(ServerUrlValueName, false); }
-                }
-            } catch (Exception) {
-                // Ignore errors when clearing
-            }
-        }
+        public const string ServerUrl = "https://assets.eagle0.net";
     }
 }

src/main/csharp/net/eagle0/clients/win/installer/EagleInstaller/MainForm.cs

@@ -9,12 +9,9 @@ namespace EagleInstaller {
         private Label _statusLabel;
         private Button _exitButton;
 
-        public string ServerUrl { get; private set; }
+        public string ServerUrl => CredentialManager.ServerUrl;
 
-        public MainForm(string serverUrl = null) {
-            ServerUrl = serverUrl ?? CredentialManager.LoadServerUrl();
-            InitializeComponent();
-        }
+        public MainForm() { InitializeComponent(); }
 
         private void InitializeComponent() {
             // Form properties

src/main/csharp/net/eagle0/clients/win/installer/EagleInstaller/configuration.txt

@@ -1,3 +1,3 @@
 manifest_name = eagle0_manifest.txt
-remote_manifest_prefix = assets/installer/
-remote_asset_prefix = assets/unity3d/win/
+remote_manifest_prefix = installer/
+remote_asset_prefix = unity3d/win/