feat(integrations): minimax-mem0 — Mem0 plugin for the MiniMax Marketplace

A declarative MiniMax plugin (MiniMax Code desktop / MiniMax Agent cloud) that
gives an agent persistent long-term memory via Mem0.

- MCP capability points at Mem0's hosted server (https://mcp.mem0.ai/mcp/,
  streamable-http); no secrets in the package.
- Skill (skills/memory/SKILL.md) tells the agent when to recall, save, update,
  and delete memory.
- Manifest, icon (180x180), and structure follow the MiniMax plugin spec;
  validated against the submission checklist and size limits.

Open item for MiniMax review: the MCP endpoint is authenticated (OAuth or
API-key bearer), so confirm whether it ships as a remote MCP (runtime handles
the OAuth handshake) or via the App/Connector path.

integrations/minimax-mem0/mem0.mcp.json

@@ -0,0 +1,11 @@
+{
+  "schemaVersion": 1,
+  "mcpServers": {
+    "mem0": {
+      "type": "streamable-http",
+      "url": "https://mcp.mem0.ai/mcp/",
+      "description": "Mem0 long-term memory: add, search, update, and delete memories so the agent remembers context across sessions.",
+      "timeout": 30000
+    }
+  }
+}