feat: add initial MCP configuration for Dolphin server

config/mcp_config.json

@@ -0,0 +1,12 @@
+{
+    "mcpServers": {
+      "dolphin-demo-database-sqlite": {
+        "command": "uvx",
+        "args": [
+          "mcp-server-sqlite",
+          "--db-path",
+          "~/.dolphin/dolphin.db"
+        ]
+      } 
+    }
+}