Add Swift MCP Server Development collection (#328)

- Add Swift MCP server best practices instruction
- Add Swift MCP server project generator prompt
- Add Swift MCP expert chat mode
- Add Swift MCP development collection manifest
- Update category READMEs

Features:
- Server setup with official Swift SDK package
- Tool/resource/prompt handlers with withMethodHandler
- Async/await and actor-based concurrency patterns
- ServiceLifecycle integration for graceful shutdown
- Stdio, HTTP, and network transport support
- JSON schema construction with Value type
- Swift 6.0+ with modern concurrency features
- Platform support: macOS 13+, iOS 16+, Linux

collections/swift-mcp-development.collection.yml

@@ -0,0 +1,35 @@
+id: swift-mcp-development
+name: Swift MCP Server Development
+description: 'Comprehensive collection for building Model Context Protocol servers in Swift using the official MCP Swift SDK with modern concurrency features.'
+tags: [swift, mcp, model-context-protocol, server-development, sdk, ios, macos, concurrency, actor, async-await]
+items:
+  - path: instructions/swift-mcp-server.instructions.md
+    kind: instruction
+  - path: prompts/swift-mcp-server-generator.prompt.md
+    kind: prompt
+  - path: chatmodes/swift-mcp-expert.chatmode.md
+    kind: chat-mode
+    usage: |
+      recommended
+
+      This chat mode provides expert guidance for building MCP servers in Swift.
+
+      This chat mode is ideal for:
+      - Creating new MCP server projects with Swift
+      - Implementing async/await patterns and actor-based concurrency
+      - Setting up stdio, HTTP, or network transports
+      - Debugging Swift concurrency and ServiceLifecycle integration
+      - Learning Swift MCP best practices with the official SDK
+      - Optimizing server performance for iOS/macOS platforms
+
+      To get the best results, consider:
+      - Using the instruction file to set context for Swift MCP development
+      - Using the prompt to generate initial project structure
+      - Switching to the expert chat mode for detailed implementation help
+      - Specifying whether you need stdio, HTTP, or network transport
+      - Providing details about what tools or functionality you need
+      - Mentioning if you need resources, prompts, or special capabilities
+
+display:
+  ordering: manual
+  show_badge: true