fix: make SURFPOOL_DATASOURCE_RPC_URL env var work and hide API keys in UI #426
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The env var was never being read because the --rpc-url CLI arg had a default_value, making the Option always Some. Changed to use clap's built-in
envattribute which properly handles the env var fallback.Also sanitized the displayed datasource URL to show only scheme and host (e.g., "https://example.com") to prevent leaking API keys in the UI.