Add Aiven MCP server (#245)

Claude-Session: https://claude.ai/code/session_01S58U7phvDgphx6ZTXuWMJQ

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

Author: its-mash

servers/io.aiven-mcp.json

@@ -0,0 +1,53 @@
+{
+  "$schema": "../schemas/server-definition.schema.json",
+  "id": "io.aiven-mcp",
+  "name": "Aiven",
+  "alias": "aiven",
+  "description": "Manage Aiven cloud data services (PostgreSQL, Apache Kafka, Valkey, ClickHouse, OpenSearch, and more) through Aiven's hosted remote MCP server. List, create, update, and delete services, projects, and integrations. Authenticates via OAuth in your browser, no local setup or token required.",
+  "logo": "https://avatars.githubusercontent.com/u/137087830?v=4",
+  "schema_version": "2.1",
+  "categories": [
+    "database",
+    "cloud"
+  ],
+  "tags": [
+    "aiven",
+    "database",
+    "cloud",
+    "postgres",
+    "kafka",
+    "valkey",
+    "clickhouse",
+    "opensearch"
+  ],
+  "transport": {
+    "type": "http",
+    "url": "https://mcp.aiven.live/mcp",
+    "metadata": {
+      "inputs": []
+    }
+  },
+  "auth": {
+    "type": "oauth",
+    "instructions": "Authenticates via OAuth 2.0 with PKCE in your browser using your Aiven account. On first connect a browser window opens so you can sign in and select your organization. No API token setup needed; tokens refresh automatically."
+  },
+  "contributor": {
+    "name": "Aiven",
+    "github": "Aiven-Open",
+    "url": "https://aiven.io"
+  },
+  "links": {
+    "repository": "https://github.com/Aiven-Open/mcp-aiven",
+    "homepage": "https://aiven.io",
+    "documentation": "https://aiven.io/docs/tools/mcp-server"
+  },
+  "platforms": [
+    "all"
+  ],
+  "capabilities": {
+    "tools": true,
+    "resources": false,
+    "prompts": false,
+    "read_only_mode": true
+  }
+}