feat: add Resend MCP server definition (#70)

* Add Resend MCP server definition

Resend MCP server for sending emails with plain text, HTML, attachments, and
scheduling. Uses resend-mcp npm package with stdio transport.

https://claude.ai/code/session_013AxurW8hPAfnUNvik354Xx

* fix: update server definition (input type 'password' -> 'text' for RESEND_API_KEY; repo URL fixed)

* fix: rename server files with transport suffix

- com.resend-mcp.json -> com.resend-mcp-npx.json (id: com.resend-mcp-npx)

Signed-off-by: Mohammod Al Amin Ashik <maa.ashik00@gmail.com>

---------

Signed-off-by: Mohammod Al Amin Ashik <maa.ashik00@gmail.com>

Author: its-mash

servers/com.resend-mcp-npx.json

@@ -0,0 +1,70 @@
+{
+  "$schema": "../schemas/server-definition.schema.json",
+  "id": "com.resend-mcp-npx",
+  "name": "Resend (npx)",
+  "alias": "resend",
+  "description": "Send emails using the Resend API. Supports plain text and HTML content, attachments, scheduling, and recipient management.",
+  "icon": "https://avatars.githubusercontent.com/u/109384852?v=4",
+  "schema_version": "2.1",
+  "categories": [
+    "communication"
+  ],
+  "tags": [
+    "resend",
+    "email",
+    "messaging",
+    "notifications"
+  ],
+  "transport": {
+    "type": "stdio",
+    "command": "npx",
+    "args": [
+      "-y",
+      "resend-mcp"
+    ],
+    "env": {
+      "RESEND_API_KEY": "${input:RESEND_API_KEY}"
+    },
+    "metadata": {
+      "inputs": [
+        {
+          "id": "RESEND_API_KEY",
+          "label": "Resend API Key",
+          "description": "API key for the Resend email API.",
+          "type": "text",
+          "required": true,
+          "secret": true,
+          "placeholder": "re_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
+          "obtain": {
+            "url": "https://resend.com/api-keys",
+            "instructions": "1. Go to resend.com/api-keys\n2. Click 'Create API Key'\n3. Select 'Sending access' permission\n4. Copy the key (starts with re_)",
+            "button_label": "Create API Key"
+          }
+        }
+      ]
+    }
+  },
+  "auth": {
+    "type": "api_key",
+    "instructions": "Create a Resend API key at https://resend.com/api-keys"
+  },
+  "contributor": {
+    "name": "Resend",
+    "github": "resend",
+    "url": "https://resend.com"
+  },
+  "links": {
+    "repository": "https://github.com/resend/resend-mcp",
+    "homepage": "https://resend.com",
+    "documentation": "https://resend.com/docs/knowledge-base/mcp-server"
+  },
+  "platforms": [
+    "all"
+  ],
+  "capabilities": {
+    "tools": true,
+    "resources": false,
+    "prompts": false,
+    "read_only_mode": false
+  }
+}