feat: initial commit — backend API + student cabinet frontend

- Go backend: auth (JWT), points earn/spend, QR token generation,
  partners, admin grant/stats endpoints with chi router
- Next.js 14 frontend: login, student dashboard, transaction history,
  QR display, partners list
- PostgreSQL migrations (4 tables), Redis cache, Docker Compose
- CORS middleware, role-based route protection, Zustand auth store

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

migrations/00004_init_earning_rules.sql

@@ -0,0 +1,21 @@
+-- +goose Up
+-- Configurable rules that determine how many points a student earns per trigger event.
+-- Managed by administrators through the admin dashboard.
+CREATE TABLE earning_rules (
+    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    name            TEXT NOT NULL,
+    points_amount   INTEGER NOT NULL CHECK (points_amount > 0),
+    -- trigger_type matches the source system or event that initiates earning
+    trigger_type    TEXT NOT NULL CHECK (trigger_type IN ('attendance', 'assignment', 'referral', 'admin')),
+    is_active       BOOLEAN NOT NULL DEFAULT TRUE,
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX ON earning_rules(trigger_type, is_active);
+
+-- Seed default admin-grant rule so administrators can grant points immediately after deploy
+INSERT INTO earning_rules (name, points_amount, trigger_type, is_active)
+VALUES ('Manual admin grant', 1, 'admin', TRUE);
+
+-- +goose Down
+DROP TABLE IF EXISTS earning_rules;