feat: Add main application views and structure

- Implemented CreateInstanceView for creating new instances.
- Added HostsView for managing SSH hosts with CRUD operations.
- Created InstancesView for displaying and managing instances.
- Developed LogsView for viewing operation logs.
- Introduced SecretsView for managing secrets associated with hosts.
- Established SettingsView for configuring application settings.
- Created MainWindow as the main application window with navigation.
- Added app manifest and configuration files for logging and settings.

OTSSignsOrchestrator.Desktop/appsettings.json

@@ -0,0 +1,45 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Debug",
+      "Microsoft.EntityFrameworkCore": "Information"
+    }
+  },
+  "FileLogging": {
+    "Enabled": true,
+    "Path": "logs",
+    "RollingInterval": "Day",
+    "RetentionDays": 7
+  },
+  "Git": {
+    "CacheDir": ".template-cache"
+  },
+  "Docker": {
+    "DefaultConstraints": [ "node.labels.xibo==true" ],
+    "DeployTimeoutSeconds": 30,
+    "ValidateBeforeDeploy": true
+  },
+  "Xibo": {
+    "DefaultImages": {
+      "Cms": "ghcr.io/xibosignage/xibo-cms:release-4.4.0",
+      "Mysql": "mysql:8.4",
+      "Memcached": "memcached:alpine",
+      "QuickChart": "ianw/quickchart"
+    },
+    "TestConnectionTimeoutSeconds": 10
+  },
+  "Database": {
+    "Provider": "Sqlite"
+  },
+  "ConnectionStrings": {
+    "Default": "Data Source=otssigns-desktop.db"
+  },
+  "InstanceDefaults": {
+    "CmsServerNameTemplate": "{abbrev}.ots-signs.com",
+    "ThemeHostPath": "/cms/ots-theme",
+    "LibraryShareSubPath": "{abbrev}-cms-library",
+    "MySqlDatabaseTemplate": "{abbrev}_cms_db",
+    "MySqlUserTemplate": "{abbrev}_cms",
+    "BaseHostHttpPort": 8080
+  }
+}