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/000097_create_wallet_expiry_reminders.up.sql

@@ -1,11 +0,0 @@
--- Which expiry reminders have gone out (docs/prd-point-coin.md F12): one per
--- customer, currency and expiry day. The row is written before the push is sent, so
--- several instances of the job, or a restart, never remind twice.
-CREATE TABLE wallet_expiry_reminders (
-    customer_id UUID NOT NULL REFERENCES customers(id) ON DELETE CASCADE,
-    currency VARCHAR(10) NOT NULL CHECK (currency IN ('POINT','COIN')),
-    expiry_date DATE NOT NULL,
-    amount BIGINT NOT NULL,
-    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
-    PRIMARY KEY (customer_id, currency, expiry_date)
-);