Remove the feature toggle system (dead code)

Audited it (couldn't query the live DB directly -- auto-mode classifier
blocks direct production reads without prior approval -- so this is a
code-only audit): GetFeatureToggles/SetFeatureEnabled/IsFeatureEnabled/
CreateFeatureToggle/DeleteFeatureToggle had exactly one caller each, all
inside their own CRUD handlers. Nothing anywhere else in the codebase
read a toggle's Enabled state to gate any actual behavior -- confirmed
by grepping every remaining .Enabled/IsFeatureEnabled reference back to
either this dead code or its own tests. It was pure UI-managed CRUD with
no consumer, unlike Trusted Agents (wired into agent.go/websocket.go)
or Data Sources (wired into the sync pipeline) which stayed.

Removes the Settings page section, the three /settings/features* routes
and handlers, the five Store methods, the FeatureToggle model, and adds
028_drop_feature_toggles.sql (next free migration number, per this
repo's convention of never renumbering -- see 021_drop_tasks.sql for
the same drop-table-forward pattern) to drop the now-unused table.
Also removed the now-dead tests for all of the above.

go build ./... and go test ./... both clean.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EZ7ikw2ukGJFTHE3bJS7zL

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