* feat(db): add channel_notes table with Drizzle schema and migrations
Adds a new `channel_notes` table (SQLite + PG) with composite PK
(account_id, channel_id) to persist per-channel notes scoped to each
ThunderHub account. Includes migration files for both database backends.
* feat(api): add ChannelNotesService with getChannelNotes query and setChannelNote mutation
Introduces ChannelNotesService (Drizzle-backed, account-scoped) with
getNotes/upsertNote methods. Exposes two new GraphQL endpoints on
ChannelsResolver: getChannelNotes (query) and setChannelNote (mutation).
* feat(client): add inline channel notes to channels table and details panel
- Adds NoteCell component to ChannelTable with click-to-edit inline input
(Enter/✓ to save, Escape to cancel)
- Fetches all notes on load via getChannelNotes query; updates optimistically
- Adds note textarea + Save button in ChannelDetails modal below fee editor
- Notes are persisted server-side and survive page refreshes
* chore: table changes
* chore: schema cleanup
* chore: cleanup table
* chore: more cleanup
* chore: db ondelete
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Co-authored-by: Anthony Potdevin <potdevin.anthony@gmail.com>
