Rename new_pool → inactive_pool

[0xSoju2]

Summary

The risk we want to price isn't "this pool was just created", it's "this pool has no swap activity keeping it balanced". A 15-minute swap-free window captures both freshly-created pools and dormant ones equally — same slippage risk, same range.

Engine wiring (in MeteoraAg dlse repo)

• New CH view `active_pools_15m` lists every pool with a swap in the last 15 minutes.
• `ActivePoolsTracker` polls it every 30s into a `DashSet`.
• Engine marks any pool absent from the set as `inactive_pool` and selects this range.

Test plan

• After merge, raw URL serves the renamed category: `curl https://raw.githubusercontent.com/MeteoraAg/dlse-config/main/slippage_config.json | jq '.slippage_base_tolerance[] | select(.name=="inactive_pool")'`
• DLSE service reloads within 5 min and starts returning `category: "inactive_pool"` for pools absent from `active_pools_15m`.

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