Move tracker-detection models into tracker-detection-api

[aibrahim-]

Task/Issue URL: https://app.asana.com/1/137249556945/task/1216988666064181
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

First PR of the tracker-detection extraction (Phase 1 of 5). Pure move, no behaviour change.

• Entity, TrackingEvent, TrackerStatus and TrackerType move from browser-api into tracker-detection-api, keeping their legacy com.duckduckgo.app.trackerdetection.model package so no consumer file changes its imports. A package rename is a possible follow-up.
• browser-api re-exports the module with api project(':tracker-detection-api'). This keeps the existing consumers (:app, privacy-dashboard-impl, pir-impl) compiling without adding the dependency to each of them.
• tracker-detection-api drops its browser-api dependency, since the models it references are now local.

Please note (DL1 from the tech design review): the root build.gradle rule that forbids -api modules from depending on other -api modules needed :tracker-detection-api added to its allowlist, alongside :browser-api and the other shared api modules. That is what makes the re-export above legal. It seems reasonable given these models are used in several places across the app, but it is a deliberate widening of that allowlist and worth a look.

Steps to test this PR

Tracker blocking is unaffected by the move

• Build and run the app
• Visit a site with trackers (e.g. a news site) and open the privacy dashboard
• Confirm the blocked trackers and their company names are listed as before

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

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[landomen]

I think this is acceptable to do considering this are core entities / classes.