feat: migrate MCP server to v2

apps/docs/docs/management/mcp.mdx

@@ -8,7 +8,12 @@ tags:
 
 # Model Context Protocol (MCP)
 
-Homarr exposes a [Model Context Protocol](https://modelcontextprotocol.io) server at `/api/mcp/mcp`, enabling AI assistants like Claude, Cursor, VS Code Copilot, and Claude Code to interact with your Homarr instance using natural language.
+Homarr exposes a [Model Context Protocol](https://modelcontextprotocol.io) server at `/api/mcp`, enabling AI assistants like Claude, Cursor, VS Code Copilot, and Claude Code to interact with your Homarr instance using natural language.
+
+The endpoint implements the stateless MCP 2026-07-28 protocol and accepts 2025 Streamable HTTP clients through a
+stateless compatibility path. It does not create protocol sessions or require sticky sessions. Homarr creates the
+server and extracts its tools only after an authenticated request reaches the route. The previous `/api/mcp/mcp` URL
+remains available as a compatibility alias, but new clients should always use `/api/mcp`.
 
 With MCP, you can ask your AI assistant to manage apps, integrations, users, boards, Docker containers, media servers, DNS settings, and more - all through Homarr's existing tRPC API, now exposed as 50+ AI-callable tools.
 
@@ -46,7 +51,7 @@ Add the following to your client's MCP configuration file:
 {
   "mcpServers": {
     "homarr": {
-      "url": "https://your-homarr-instance.com/api/mcp/mcp",
+      "url": "https://your-homarr-instance.com/api/mcp",
       "headers": {
         "ApiKey": "<your-api-key>"
       }
@@ -77,7 +82,7 @@ Replace `<your-api-key>` with your actual API key. Never commit API keys to vers
   "mcpServers": {
     "homarr": {
       "command": "npx",
-      "args": ["-y", "mcp-remote", "https://your-homarr-instance.com/api/mcp/mcp", "--header", "ApiKey:<your-api-key>"]
+      "args": ["-y", "mcp-remote", "https://your-homarr-instance.com/api/mcp", "--header", "ApiKey:<your-api-key>"]
     }
   }
 }
@@ -100,6 +105,10 @@ Custom Widget and Workshop authoring are different: their tools, prompts, and re
 key owner is a Homarr administrator. Non-administrator keys cannot discover or invoke those capabilities. Creating an
 API key never elevates the owner.
 
+OAuth authorization and token requests bind issued credentials to the canonical `/api/mcp` resource. Dynamic client
+registration remains available for compatibility with current MCP clients while the ecosystem transitions toward
+pre-registered clients and Client ID Metadata Documents.
+
 ## Testing the Connection
 
 Verify your MCP endpoint is working:
@@ -107,13 +116,17 @@ Verify your MCP endpoint is working:
 ```bash
 curl -s -X POST \
   -H "Content-Type: application/json" \
-  -H "Accept: application/json, text/event-stream" \
+  -H "Accept: application/json" \
   -H "ApiKey: <your-api-key>" \
-  -d '{"jsonrpc":"2.0","method":"initialize","params":{"protocolVersion":"2025-03-26","capabilities":{},"clientInfo":{"name":"test","version":"1.0"}},"id":1}' \
-  https://your-homarr-instance.com/api/mcp/mcp
+  -H "Mcp-Method: server/discover" \
+  -H "Mcp-Name: homarr" \
+  -d '{"jsonrpc":"2.0","method":"server/discover","params":{"_meta":{"io.modelcontextprotocol/protocolVersion":"2026-07-28","io.modelcontextprotocol/clientInfo":{"name":"test","version":"1.0"},"io.modelcontextprotocol/clientCapabilities":{}}},"id":1}' \
+  https://your-homarr-instance.com/api/mcp
 ```
 
-A successful response includes the server capabilities and available tools. Use `tools/list` to see all available tools:
+A successful response includes the supported protocol versions and server capabilities. Use `tools/list` to see all
+available tools. MCP v2 clients add the per-request metadata and `Mcp-Method` / `Mcp-Name` headers automatically; the
+abbreviated request below uses the stateless 2025 compatibility path for readability:
 
 ```bash
 curl -s -X POST \
@@ -121,9 +134,12 @@ curl -s -X POST \
   -H "Accept: application/json, text/event-stream" \
   -H "ApiKey: <your-api-key>" \
   -d '{"jsonrpc":"2.0","method":"tools/list","id":1}' \
-  https://your-homarr-instance.com/api/mcp/mcp
+  https://your-homarr-instance.com/api/mcp
 ```
 
+Tool catalogs are returned in deterministic order and may be cached privately by the client for five minutes. The
+removed HTTP+SSE `/sse` and `/message` transports return `410 Gone`; use the single Streamable HTTP endpoint instead.
+
 ## Available Tools
 
 Homarr exposes 50+ tools organized by namespace. Each tool is either a **query** (GET, read-only) or **mutation** (POST, write action).