Add donation platform with Stripe integration and recurring support

migrations/0014_add_donations.sql

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+-- Migration 0014: Add donations support
+
+CREATE TABLE IF NOT EXISTS donations (
+    id                       TEXT PRIMARY KEY,
+    user_id                  TEXT,
+    amount                   INTEGER NOT NULL,
+    currency                 TEXT NOT NULL DEFAULT 'usd',
+    donation_type            TEXT NOT NULL DEFAULT 'one-time',
+    donor_name               TEXT,
+    donor_email              TEXT,
+    message                  TEXT,
+    anonymous                INTEGER NOT NULL DEFAULT 0,
+    status                   TEXT NOT NULL DEFAULT 'pending',
+    stripe_payment_intent_id TEXT,
+    stripe_subscription_id   TEXT,
+    stripe_customer_id       TEXT,
+    created_at               TEXT NOT NULL DEFAULT (datetime('now')),
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE SET NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_donations_created_at ON donations(created_at);
+CREATE INDEX IF NOT EXISTS idx_donations_status     ON donations(status);
+CREATE INDEX IF NOT EXISTS idx_donations_user_id    ON donations(user_id);
+CREATE INDEX IF NOT EXISTS idx_donations_status_created_at ON donations(status, created_at);