Move EntityLookup into tracker-detection-api

[aibrahim-]

Task/Issue URL: https://app.asana.com/1/137249556945/task/1216988877446431
Tech Design URL (if applicable): https://app.asana.com/1/137249556945/task/1216706645739239
API Proposals URL(s) (if applicable): to follow — will be added before merge

Description

Phase 2 of the tracker-detection extraction, stacked on the Phase 1 PR. Pure move, no behaviour change.

• EntityLookup moves from browser-api into tracker-detection-api, keeping its com.duckduckgo.app.trackerdetection package, so SiteFactoryImpl and the other consumers need no import changes. They already reach it through the browser-api re-export added in the previous PR.
• tracker-detection-api gains androidx.annotation for @WorkerThread, which it previously picked up transitively through browser-api.

The goal of this phase is that everything :app production code consumes goes through the api, with no :app → impl class imports.

Steps to test this PR

Tracker entity attribution still works

• Build and run the app
• Visit a site with trackers and open the privacy dashboard
• Confirm trackers are still grouped under the right company names

UI changes

Before	After
No UI changes	No UI changes

[github-actions]

⚠️ API Proposal reminder

This PR changes the public surface of one or more -api modules, but the API Proposals field of the PR description is empty. This is a non-blocking reminder — please double-check whether a proposal is needed.

Changed -api source files:

• browser-api/src/main/java/com/duckduckgo/app/trackerdetection/EntityLookup.kt
• tracker-detection/tracker-detection-api/src/main/java/com/duckduckgo/app/trackerdetection/EntityLookup.kt

To clear this reminder, edit the PR description and either:

• add the approved API Proposal link(s) in the API Proposals field (one per line), or
• write None there if this PR does not change the public API (e.g. KDoc, comments, tests).

See the API Proposals section in .claude/docs/contributions.md for details.

[claude]

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