Add PyPI-backed watcher version dropdowns and drop unused channel field

[wasimxyz]

Summary

• Replace free-text latest/min-supported version inputs on /settings/watchers with searchable PyPI-backed comboboxes (free-text fallback when PyPI is unreachable)
• Remove the unused cosmetic channel field from the release config UI, API, OpenAPI schema, DB (migration 0033), and watcher client
• Keep the currently saved version selectable even when it is not on PyPI (e.g. test pins like 9.9.9)

Test plan

• Apply migration (npm run db:migrate or db:push in web/) and open /settings/watchers as an admin
• Confirm Latest version and Minimum supported version show PyPI releases newest-first, with a None option
• Save a version from the dropdown and verify GET /api/v1/watchers/:id/update-check returns it without a channel field
• With a non-PyPI saved value (e.g. 9.9.9), confirm it appears as (current) in the combobox
• Run make check-all and relevant watcher/web tests

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Project	Deployment	Actions	Updated (UTC)
data-hub	Ready	Preview, Comment	Jul 17, 2026 9:12pm

[wasimxyz]

All test-plan items passed.

Step	Result
Apply migration	Applied DROP COLUMN channel on data-hub-local (drizzle migrate journal was empty locally, so ran SQL directly). Column gone.
Open /settings/watchers as admin	Signed in as dev@local, page loaded with two comboboxes; no channel field.
PyPI dropdowns + None	Latest: None — disable self-updates, then 0.5.2 → 0.1.0 newest-first. Min: None — no version floor, same release list.
Save + update-check	Saved 0.5.2; toast “Watcher release saved”. GET .../update-check → {"latest_version":"0.5.2","min_supported_version":"0.1.0","mandatory":false} — no channel.
Non-PyPI (current)	With saved 9.9.9, Latest dropdown showed 9.9.9 (current) above PyPI releases.
Checks / tests	make check-all passed; watcher unit tests 76 passed; web integration watcher-release + watchers 49 passed.

Local DB latest_version is now 0.5.2 from the UI save. Dev server was restarted afterward.