Add Feedback domain module: public submission flow, admin CRUD, reporting (#7)

Co-authored-by: Patrick Müller <mail@pmueller.me>
Reviewed-on: #7
Co-authored-by: Patrick Mueller <patrick@mueller-patrick.tech>
Co-committed-by: Patrick Mueller <patrick@mueller-patrick.tech>

src/models/feedback/feedback.dates.ts

@@ -0,0 +1,13 @@
+/**
+ * Formats a Date using its local getters (not toISOString/UTC), so the
+ * wall-clock time the server is running in is what gets stored/displayed -
+ * never silently shifted by a UTC conversion. Used both for MySQL DATETIME
+ * literals (events.admin.service.ts) and CSV export (csv.service.ts): same
+ * requirement, same format, in either context.
+ */
+export const formatDatetime = (value: Date | string | null): string => {
+	if (!value) return '';
+	const d = value instanceof Date ? value : new Date(value);
+	const pad = (n: number) => String(n).padStart(2, '0');
+	return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}:${pad(d.getSeconds())}`;
+};