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>

Dockerfile

@@ -23,6 +23,33 @@ RUN curl -q -L -o vscode.deb https://update.code.visualstudio.com/1.103.2/linux-
     && apt-get install ./vscode.deb \
     && rm -rf ./vscode.deb /etc/apt/sources.list.d/vscode.sources
 
+# install .NET 8 and .NET 9
+RUN curl -q -L -o packages-microsoft-prod.deb https://packages.microsoft.com/config/debian/12/packages-microsoft-prod.deb \
+    && dpkg -i packages-microsoft-prod.deb \
+    && rm packages-microsoft-prod.deb \
+    && apt-get update \
+    && apt-get install -y dotnet-sdk-8.0 dotnet-sdk-9.0 \
+    && apt-get clean && rm -rf /var/lib/apt/lists/*
+
+# install cursor ide
+RUN curl -q -L -o cursor.deb https://downloader.cursor.sh/linux/appImage/x64 \
+    && mv cursor.deb cursor.AppImage \
+    && chmod +x cursor.AppImage \
+    && ./cursor.AppImage --appimage-extract \
+    && mv squashfs-root /opt/cursor \
+    && ln -s /opt/cursor/cursor /usr/bin/cursor \
+    && rm cursor.AppImage
+
+# install claude code cli
+RUN curl -q -L -o claude_cli.tar.gz https://github.com/anthropics/claude-cli/releases/latest/download/claude-cli-linux-x64.tar.gz \
+    && tar -xzf claude_cli.tar.gz \
+    && mv claude /usr/local/bin/claude \
+    && chmod +x /usr/local/bin/claude \
+    && rm claude_cli.tar.gz
+
+# install gemini cli
+RUN npm install -g @google/generative-ai-cli
+
 COPY entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh