feat(server): build axum web server for licensing, landing page, and updates

server/migrations/001_init.sql

@@ -0,0 +1,13 @@
+CREATE TABLE IF NOT EXISTS licenses (
+    id            INTEGER PRIMARY KEY AUTOINCREMENT,
+    payment_id    TEXT NOT NULL UNIQUE,
+    hwid          TEXT NOT NULL,
+    device_count  INTEGER NOT NULL DEFAULT 1,
+    max_devices   INTEGER,
+    expires_at    TEXT,
+    created_at    TEXT NOT NULL,
+    updated_at    TEXT NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_licenses_payment_id ON licenses(payment_id);
+CREATE INDEX IF NOT EXISTS idx_licenses_hwid ON licenses(hwid);