feat(minimax-mem0): App (OAuth Connector) submission form

Mem0's authenticated MCP is integrated via MiniMax's Connector (like EverMe),
giving a one-click Connect UX instead of a manual API key. Uses the MiniMax
.minimax-plugin/ submission format with apps:[mem0.app.json].

mem0.app.json provider is a placeholder until MiniMax completes Connector
integration and assigns one; mem0's OAuth MCP is already fully compliant
(streamable-http, Auth Code + PKCE S256, refresh tokens, DCR).

integrations/minimax-mem0/.minimax-plugin/plugin.json

@@ -0,0 +1,18 @@
+{
+  "schemaVersion": 1,
+  "name": "mem0",
+  "displayName": "Mem0 Memory",
+  "version": "0.1.0",
+  "description": "Persistent long-term memory for your agent: remember preferences, decisions, and project context across sessions, and recall them on demand.",
+  "author": "Mem0",
+  "icon": "icon.png",
+  "category": "Productivity",
+  "exampleQueries": [
+    "Remember that I prefer TypeScript and pnpm",
+    "What do you remember about my project?",
+    "Update what you know about my deployment setup"
+  ],
+  "apps": ["mem0.app.json"],
+  "mcpServers": [],
+  "skills": ["skills/memory/SKILL.md"]
+}