feat(dir): dht only remote discovery

[tkircsi]

Closes #1972

[coderabbitai]

Important

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e47f92c7-27d2-4700-9237-51fdb80882be

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

---

_{Comment @coderabbitai help to get the list of available commands.}

[codecov]

Codecov Report

❌ Patch coverage is 80.74792% with 139 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
server/routing/routing_local.go	67.4%	20 Missing and 10 partials ⚠️
server/routing/routing.go	32.4%	16 Missing and 7 partials ⚠️
server/routing/advertise.go	80.9%	15 Missing and 7 partials ⚠️
server/routing/search_remote.go	87.0%	16 Missing and 5 partials ⚠️
...m/migrations/004_purge_orphaned_record_children.go	47.4%	10 Missing ⚠️
reconciler/tasks/metrics/task.go	84.6%	4 Missing and 2 partials ⚠️
server/routing/routing_remote.go	77.3%	4 Missing and 1 partial ⚠️
server/database/gorm/record.go	66.7%	2 Missing and 2 partials ⚠️
server/database/gorm/record_labels.go	84.0%	2 Missing and 2 partials ⚠️
server/routing/label_keys.go	92.0%	2 Missing and 2 partials ⚠️
... and 4 more

📢 Thoughts on this report? Let us know!

[csirmazbendeguz]

In the issue you mentioned that to migrate to v2, users need to delete the routing datastore directory.
Can we do this in a migration automatically?