Add Other Purchases to budget page

- New other_purchases table (date, total, notes)
- /api/other CRUD endpoints
- Budget stats now include other costs in cost/egg and cost/dozen math
- Budget page: new Log Other Purchases form, stat cards for other costs,
  combined Purchase History table showing feed and other entries together

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

mysql/init.sql

@@ -43,3 +43,15 @@ CREATE TABLE IF NOT EXISTS feed_purchases (
     PRIMARY KEY (id),
     INDEX idx_date (date)
 ) ENGINE=InnoDB;
+
+-- ── Other purchases ───────────────────────────────────────────────────────────
+-- Catch-all for non-feed costs: bedding, snacks, shelter, etc.
+CREATE TABLE IF NOT EXISTS other_purchases (
+    id         INT UNSIGNED   NOT NULL AUTO_INCREMENT,
+    date       DATE           NOT NULL,
+    total      DECIMAL(10, 2) NOT NULL,
+    notes      TEXT,
+    created_at DATETIME       NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (id),
+    INDEX idx_date (date)
+) ENGINE=InnoDB;