src: rename chainlink to oracle

[dB2510]

Note

Medium Risk
Broad rename touches core contracts (SSPRouter, BaseAdapter) and their public interfaces/events, so downstream integrations, deployments, and upgrades will break if any callers still reference the old Chainlink* API despite no intended pricing-logic change.

Overview
Renames the on-chain pricing component from ChainlinkPriceFeed to OraclePriceFeed end-to-end, updating SSPRouter/BaseAdapter storage, setters, events, errors, and interface types to use setOraclePriceFeed and IOraclePriceFeed.

Updates deployment/upgrade scripts, verification tooling, env vars, test scripts/mocks, and documentation to match the new naming (ORACLE_PRICE_FEED_*), including deterministic address computation and configuration scripts.

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