Revert "feat(loyalty): EnakPoint & EnakCoin" (#32)

This reverts merge commit 645da30, returning main to f0ff59f.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

migrations/000091_create_organization_settings.up.sql

@@ -1,35 +0,0 @@
--- Settings that must be the same in every outlet of an organization, starting with the
--- loyalty ones (docs/prd-point-coin.md F2, F12): point value, exchange rate, transfer
--- limits and expiry. Same key-value shape as outlet_settings.
-CREATE TABLE organization_settings (
-    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
-    organization_id UUID NOT NULL REFERENCES organizations(id) ON DELETE CASCADE,
-    key VARCHAR(255) NOT NULL,
-    value TEXT,
-    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
-    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
-    UNIQUE(organization_id, key)
-);
-
--- The unique constraint leads with organization_id, so it also serves the plain
--- per-organization lookups and there is no separate index on that column.
-
--- Who changed which loyalty setting, from what, to what (F2). Covers both the
--- organization settings above and the per-outlet loyalty keys in outlet_settings.
--- Append-only. Values are stored as text, the same as in the settings tables.
-CREATE TABLE loyalty_setting_changes (
-    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
-    organization_id UUID NOT NULL,
-    -- NULL for an organization setting.
-    outlet_id UUID,
-    key VARCHAR(100) NOT NULL,
-    -- NULL when the key had no stored value yet (it was on its default).
-    old_value TEXT,
-    new_value TEXT,
-    changed_by UUID NOT NULL,
-    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
-);
-
-CREATE INDEX idx_loyalty_setting_changes_organization_id_created_at ON loyalty_setting_changes(organization_id, created_at DESC);
-CREATE INDEX idx_loyalty_setting_changes_outlet_id_created_at ON loyalty_setting_changes(outlet_id, created_at DESC)
-    WHERE outlet_id IS NOT NULL;