Add development tools: .NET SDKs, Cursor IDE, and AI CLI tools

- Install .NET SDK 8.0 and 9.0 with Microsoft package repository
- Add Cursor IDE with AppImage installation and desktop shortcut
- Install Claude CLI from GitHub releases
- Install Gemini CLI via npm
- Update sandbox mode handling for Cursor IDE
- Add API key setup instructions for AI CLI tools

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

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

.claude/settings.local.json

@@ -0,0 +1,9 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(git add:*)"
+    ],
+    "deny": [],
+    "ask": []
+  }
+}