[Bug]: Respect GATEWAY_TOOL_NAME_SEPARATOR for gateway slug

[madhav165]

🐞 Bug Summary

Utilize GATEWAY_TOOL_NAME_SEPARATOR to separate words in slug of gateway_name instead of defaulting to -

🧩 Affected Component

Select the area of the project impacted:

• mcpgateway - API
• mcpgateway - UI (admin panel)
• mcpgateway.wrapper - stdio wrapper
• Federation or Transports
• CLI, Makefiles, or shell scripts
• Container setup (Docker/Podman/Compose)
• [x ] Other (explain below)
  • How slug in stored in database will change

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🔁 Steps to Reproduce

1. Run MCP Gateway and add a gateway with a name such as test gateway. Let's say it has tool get_time. The tool name would be displayed as test-gateway-get-time
2. Change GATEWAY_TOOL_NAME_SEPARATOR to _ and restart MCP Gateway.
3. Tool name changes to test-gateway_get-time

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🤔 Expected Behavior

Tool name should have been test_gateway_get_time

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[madhav165]

Closed with PR #431